[单项选择]It is useful to be able to predict the extent to which a price change will affect supply and demand（）
A. 物价变化对需求产生影响，能预见价格变化的程度是很有用的。
B. 能预测物价变化对供求的影响程度是很有用的。
C. 供求对物价能起反拨作用。预先得知其中的奥妙，必有好处。
D. 物价变化对供求关系起作用。如有能力预测其产生的影响将大有益处。

[单项选择]It is useful to be able to predict the extent to which a price change will affect supply and demand．
A. 物价变化对需求产生影响，能预见价格变化的程度是很有用的。
B. 能预测物价变化对供求的影响程度是很有用的。
C. 供求对物价能起反拨作用。预先得知其中的奥妙，必有好处。
D. 物价变化对供求关系起作用。如有能力预测其产生的影响将大有益处。

[单项选择]It is useful to be able to predict the extent（）which a price change will affect supply and demand.
A. with
B. from
C. for
D. to

[单项选择]It is useful to be able to predict the extent ______ which a price change will affect supply and demon.


A. from
B. with
C. to
D. for

[单项选择]This difference applies also to the extent______ which people lean over one another in conversation.
A. with
B. to
C. at
D. for

[单项选择]______ more time, the scientists will be able to work out a good solution to the problem.
A. To give
B. Giving
C. Given
D. Be given

[单项选择]______, the president is not able to get his own way on every issue.
A) Popular as is he C) Popular as he is
B) As he is popular D) As popular he is

[单项选择]I was able to see an English movie in the ______ with ease after two years' study.
A. origin
B. source
C. resource
D. original

[单项选择]It is difficult to accurately predict earthquakes because______.


A. earthquakes may take place anywhere, anytime
B. earthquakes may happen unexpectedly under the sea
C. earthquakes may take place while people are asleep
D. the taking place of earthquakes involves many factors

[单项选择]I wish I _________ able to talk with him when he was here last ningt.


A. were
B. was
C. had been
D. Would be

[单项选择]Many artists predict that this brilliant young actor ______ to be a shining star.
A. destines
B. will be destined
C. is destined
D. has been destined

[单项选择]

Text 4
The recent, apparently successful prediction by mathematical models of an appearance of El Nifio—the warm ocean current that periodically develops along the Pacific coast of South America -- has excited researchers. Jacob Bjerkness pointed out over 20 years ago how winds might create either abnormally warm or abnormally cold water in the eastern equatorial Pacific. Nonetheless, until the development of the models no one could explain why conditions should regularly shift from one to the other, as happens in the periodic oscillations between appearance of the warm El Nifio and the cold so-called anti-El Nifio. The answer, al least if the current model that links the behavior of the ocean to that of the atmosphere is correct, is to be found in the ocean.
It has long been known that during an El Niflo, two conditions exist: (1) unusually warm water extends along the eastern Pacific, principally along the coasts of Ecuador and Peru, and (2) winds b
A. cold coastal water near Peru.
B. winds blowing from the west.
C. random occurrence.
D. worldwide effects.