[单项选择]As （　） known to all, language has been developed through social contacts.
A. is
B. are
C. though
D. if

[单项选择]（）he has become a rich man is known to all in our town.
A. Because
B. That
C. /
D. What

[单项选择]

Passage Six
Economics has long been known as the dismal science. But is any economist so dreary as to criticize Christmas At first glance, the holiday season in western economies seems a treat for those concerned with such vagaries as GDP growth. After all, everyone is spending; in America, retailers make 25% of their yearly sales and 60% of their profits between Thanksgiving and Christmas. Even so, economists find something to worry about in the nature of the purchases being made.
Much of the holiday spending is on gifts for others. At the simplest level, giving gifts involves the giver thinking of something that the recipient would like—he tries to guess her preferences, as economists say—and then buying the gift and delivering it. Yet this guessing of preferences is no mean feat; indeed, it is often done badly. Every year, ties go unworn and books unread. And even if a gift is enjoyed, it may not be what the recipient would have bought had th
A. prove the mismatch between wants and gifts
B. spark new ideas of economic studies on holiday spending
C. evaluate the disparity between wants and gifts in economic terms
D. discover the exact cost of holiday spending on gift-giving

[单项选择]As is known to all, ______ Yang Liwei has become a space hero is ______ we have expected.


A. that; which
B. what; that
C. what; which
D. that; what

[单项选择]What has NOT been controlled at all as regards water pollution


A. Industrial polluters.
B. Sewage.
C. Rain runoff.
D. Toxic substances.

[单项选择]It has long been known that total sleep ______is 100 percent fatal to rats, yet, upon examination of the dead bodies, the animals look completely normal.
A. deposition
B. destruction
C. deprivation
D. reduction

[单项选择]Canada is well known for all the following EXCEPT
A. its mineral resources
B. its heavy industries
C. its forest resources
D. its fertile and arable land

[单项选择]The problem has been（）my mind all day.
A. preying on
B. getting at
C. taking on
D. seeing to

[单项选择]It is known to all that children in this region have strong ______ to swimming in summer because of the hot weather.


A. inclination
B. exposure
C. flux
D. correlation

[单项选择]As is known to all, trade and specialization go hand in hand and enable each of us to have more products to use（）
A. 众所周知，现代贸易需要生产的专门化，才能让我们用到更多新产品。
B. 众所周知，贸易和专门化相辅相成，使我们每个人能使用更多的产品。
C. 众所周知，贸易和专门化总是同时进行，使我们能生产出更多的产品。
D. 众所周知，现代贸易需要生产的专门化，才能够制造出更多的新产品。

[单项选择]（）is known to all,good friends add happinesss and value to each other's life.
A. As
B. Since
C. Like
D. Though

[单项选择]As is known to all, the newcomers must have a good command of English in this company.


A. 正如所有人知道的，这个公司新来的人英语必须不错。
B. 众所周知，这个公司新来的人英语必须不错。
C. 众所周知，新来的人在这个公司必须学英语。
D. 众所周知，这个公司的老板必须用英语发号施令。

[单项选择]The best known of all the Arctic birds, （）.
A. birdwatchers favor ptarmigans
B. being ptarmigans' and birdwatchers' favorites
C. favored by both ptarmigans and birdwatchers
D. ptarmigans are a favorite of birdwatchers