题目内容

AI long ago mastered chess, the Chinese board game Go and even the Rubik’s Cube, ___ in just 0. 38 seconds.

A. which managed to solve
B. which it managed to solve
C. for which it managed to solve
D. to which it managed to solve

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The need for water and soil conservation was recognized during the latter part of the last century, and has been ___ developed in the American continent.

A. excessively
B. exceedingly
C. extensively
D. exclusively

The ___ of the whole operation has been jeopardized by one careless resident doctor who left a piece of gauze in the patient’s body.

A. safety
B. security
C. insecurity
D. protection

After being defamed online, the actress tried to ___ by drinking poison.

A. make for
B. make off
C. move out
D. move off

Night follows day as a ___ of natural laws.

A. substitution
B. requirement
C. supplement
D. necessity

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