[单项选择]By the late 1950s scientists had already __________ enough evidence to show a clear link between smoking and cancer.
A. assembled
B. proved
C. acquired
D. accumulated

[单项选择]By the late 1950s scientists had already __________ enough evidence to show a clear link between smoking and cancer.


A. assembled
B. proved
C. acquired
D. accumulated

[单项选择]Teenagers in the 1950s, who had to ______ an increasingly atomized family life and domestic and international tensions, scorned the sterile version of American life.
A. injure
B. conjure
C. confront
D. inflow

[单项选择]Scientists have already found problems that associated（）living in the ocean are nearly the same as those of living in outer space.
A. to
B. of
C. with
D. at

[单项选择]During the late 1950s, the Brazilian economy ______ forward as heavy industries and basic infrastructure--roads, communications, and construction--expanded.
A. increased
B. splashed
C. surged
D. improved

[单项选择]British political scientists once had difficulty understanding how the unbalancing effects of affording greater representation to the wealthy was once the means of preserving the______of the commonwealth.
A. (A) character
B. (B) equipoise
C. (C) affluence
D. (D) discontent
E. (E) rectitude

[单项选择]______ he realized it was already too late for us to return home.
A. No sooner it grew dark when
B. Hardly it grew dark than
C. It was not until dark that
D. Scarcely it grew dark than

[单项选择]Scientists had thought the "explosion" was caused by ______.


A. a meteor
B. a small comet
C. an spaceship from another planet
D. some big fire

[单项选择]______ 11:30 yesterday they had already had lunch.
A. On
B. At
C. By
D. With

[单项选择]Speaker A: It' s already late. I think I' d better go now. And thank you for the dinner.Speaker B:______

[单项选择]Speaker A: It's already late. I think I'd better go now. And thank you for the dinner.Speaker B: ________

[单项选择]

In the 1950s, the pioneers of artificial intelligence(AI)predicted that, by the end of this century, computers would be conversing with us at work and robots would be performing our house work. But as useful as computers are, they’re nowhere close to achieving anything remotely resembling these early aspirations for humanlike behavior. Never mind something as complex as conversation: the most powerful computers struggle to reliably recognize the shape of and object, the most elementary of tasks for a ten-month-old kid.
A growing group of AI researchers think they know where the field went wrong. The problem, the scientists say, is that AI has been trying to separate the highest, most abstract levels of thought, like language and mathematics, and to duplicate them with logical, step-by-step pro grams. A new movement in AI, on the other hand, takes a closer look at the more roundabout way in which nature came up with intelligence. Many of these researchers study evolu
A. It has created a sensation among artificial intelligence researchers bu will soon die out.
B. It's a breakthrough in duplicating human thought processed.
C. It's more like a peculiar game rather than a real scientific effort.
D. It may prove to be in the right direction though nobody is sure of its future prospects.