Complete the sentences with the correct expressions of the following given words: assure You may ____that we will keep you informed of the execution of your order. We can ____you ____the best quality of our goods.

We can reform our public health care system, which still gives us, for all its flaws, the best health care in the world.

______ the present market trend, we have to say that our price is really the best we can quote.

A. With

B. On

C. Because

D. For

New research from Vanderbilt University suggests that we can remember more faces than other objects and that faces "stick" the best in our short-term memory. The reason may be that our expertise in remembering faces allows us to package them better for memory.

"Our results show that we can store more faces than other objects in our visual short-term memory," Gauthier, associate professor of psychology and the study's co-author, said. "We believe this happens because of the special way in which faces are encoded."

Kim Curby, the study's primary author and a post-doctoral researcher at Yale University, likens such encoding to packing a suitcase. "How much you can fit in a bag depends on how well you pack it," she said. "In the same way, our expertise in 'packaging' faces means that we can remember more of them."

Curby and Gauthier's research has practical implications for the way we use visual short-term memory or VSTM. "Being able to store more faces in VSTM may be very useful in complex social situations," Gauthier said.

"This opens up the possibility of training people to develop similarly superior VSTM for other categories of objects," Curby added.

Short-term memory is crucial to our impression of a continuous world, serving as temporary storage for information that we are currently using. For example, in order to understand this sentence, your short-term memory will remember the words in the beginning while you read through to the end. VSTM is a component of short-term memory that helps us process and briefly remember images and objects, rather than words and sounds.

VSTM allows us to remember objects for a few seconds, but its capacity is limited. Curby and Gauthier's new research focuses on whether we can store more faces than other objects in VSTM, and the possible mechanisms underlying this advantage.

Study participants studied up to five faces on a screen for varying lengths of time (up to four seconds). A single face was later presented and participants decided if this was a face that was part of the original display. For a comparison, the process was repeated with other objects, like watches or cars.

Curby and Gauthier found that when participants studied the displays for only a brief amount of time (half a second), they could store fewer faces than objects in VSTM. They believe this is because faces are more complex than watches or cars and require more time to be encoded. Surprisingly, when participants were given more time to encode the images (four seconds), an advantage for faces over objects emerged.

The researchers believe that our experience with faces explains this advantage. This theory is supported by the fact that the advantage was only obtained for faces encoded in the upright orientation, with which we are most familiar. Faces that were encoded upside-down showed no advantage over other objects.

We can remember more faces than other objects in our VSTM because______.

A．we have better knowledge for storing faces

B．faces last longer in our memory

C．we package faces better for memory

D．faces are encoded in a special way in our mind

Technology surrounds us and is a part of our daily lives. We can find technological innovations at home , our workplaces , our schools , and our playgrounds. (1)________technology has improved our lives in some ways , it has also brought many negative(2)________.

Modern technology has made life very (3) ________. We have everything we need and our inventions take care of so many unpleasant details in our day-to-day lives. Foods from all over the world are available at local supermarkets. International travel is now fast and easy. We can talk to friends on cell phones any time. anywhere. and we can catch a TV show from many countries far away.

(4)________. these conveniences have a price. We consume too much energy and too many resources , and we create too much waste. The world is overflowing with pollution and waste. We cannot continue like this forever. We should be more responsible about protecting our world while still enjoying conveniences. (5)________our natural world is destroyed. The conveniences will be useless.

?Read the article below about the central problem of Economics.

?Choose the best word to fill each gap, from A, B, C or D.

?For each question 19—33,mark one letter (A, B, C or D) on your Answer Sheet.

?There is an example at the beginning.

The Central Problem of Economics

The central problem of economics is to satisfy the people's and nation's wants.

The problem we are faced with is that our resources, here identified as money, are limited. The only way we can resolve our problem is to make choices. After looking at our resources, we must examine our list of (19) and identify the things we need immediately, those we can postpone, and (20) we cannot afford. As individuals, we face the central problem involved in economics deciding just how to allocate (分配) our limited resources to provide (21) with the greatest satisfaction of our wants. Nations face the same problem. As a country's population grows the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there (22) are enough re sources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family (23) room, in the conference room of the corporation (24) of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find methods of allocating limited resources in order to satisfy unlimited wants.

A short time ago economists (25) goods into two categories, free and economic. The former, like air and water, were in (26) abundance that economists had no concern for them. After all, economics is the (27) of scarcity (匱乏) and what to do about it. Today many of these "free goods" are (28) very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately (最終) (29) the producers' extra costs, and (30) taxpayers who pay for the government's involvement in cleaning the environment.

In the 1990s, almost all goods are (31) Only by effort and money can they be obtained in the form. people wish.

Meeting the needs of people and froming resources available (32) the basic activity of production. In trying to meet (33) wants from limited economic goods, production leads to new problems in economics.

(19)

A．want

B．problems

C．wants

D．resources

Read the article below about the central problem of Economics.

Choose the best word to fill each gap, from A, B, C or D.

For each question 19—33, mark one letter (A, B, C or D) on your Answer Sheet.

There is an example at the beginning.

The Central Problem of Economics

The central problem of economics is to satisfy the people's and nation's wants.

The problem we are faced with is that our resources, here identified as money, are limited. The only way we can resolve our problem is to make choices. After looking at our resources, we must examine our list of(19)…and identify the things we need immediately, those we can postpone, and(20)…we cannot afford. As individuals, we face the central problem involved in economics—deciding just how to allocate (分配)our limited resources to provide(21)…with the greatest satisfaction of our wants.

Nations face the same problem. As a country's population grows the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there(22)…are enough resources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family(23) …room, in the conference room of the corporation (24)…of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find methods of allocating limited resources in order to satisfy unlimited wants.

A short time ago economists(25)…goods into two categories, free and economic. The former, like air and water, were in(26)…abundance that economists had no concern for them. After all, economics is the(27)…of scarcity(匱乏)and what to do about it. Today many of these " free goods" are(28)…very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately(最終)(29)…the producers' extra costs, and(30)…taxpayers who pay for the government's involvement in cleaning the environment.

In the 1990s, almost all goods are (31)…Only by effort and money can they be obtained in the form. people wish.

Meeting the needs of people and froming resources available (32)… the basic activity of production. In trying to meet(33)…wants from limited economic goods, production leads to new problems in economics.

(19)

A．want

B．problems

C．wants

D．resources

—Read the article below about the central problem of Economics.

—Choose the best word to fill each gap, from A, B, C or D.

—For each question 19-33,mark one letter (A, B, C or D) on your Answer Sheet.

—There is an example at the beginning.

The Central Problem of Economics

The central problem of economics is to satisfy the people's and nation's wants.

The problem we are faced with is that our resources, here identified as money, are limited. The only way we can resolve our problem is to make choices. After looking at our resources, we must examine our list of (19)______ and identify the things we need immediately, those we can postpone, and (20)______ we cannot afford. As individuals, we face the central problem involved in economics deciding just how to allocate (分配) our limited resources to provide (21)______ with the greatest satisfaction of our wants. Nations face the same problem. As a country's population grows the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there (22)______ are enough re sources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family (23)______ room, in the conference room of the corporation (24)______ of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find methods of allocating limited resources in order to satisfy unlimited wants.

A short time ago economists (25)______ goods into two categories, free and economic. The former, like air and water, were in (26)______ abundance that economists had no concern for them. After all, economics is the (27)______ of scarcity (匱乏) and what to do about it. Today many of these "free goods" are (28)______ very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately (最終) (29)______ the producers' extra costs, and (30)______ taxpayers who pay for the government's involvement in cleaning the environment.

In the 1990s, almost all goods are (31)______ Only by effort and money can they be obtained in the form. people wish.

Meeting the needs of people and forming resources available (32)______ the basic activity of production. In trying to meet (33)______ wants from limited economic goods, production leads to new problems in economics.

A．want

B．problems

C．wants

D．resources