题目内容

Since prehistoric people first applied natural pigments to cave walls, ______ have painted

A. when artists
B. artists
C. artists who
D. that artists

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A. the environment is polluted
B. they are exposed to ultraviolet rays
C. they are very old
D. the supply of water is inadequate

A. located
B. flooded
C. restricted
D. pushed

A. Her professor.
B. A classmate.
C. Her former boss.
D. A foreign diplomat.

A. It was well planned.
B. It was completed in a short time.
C. It was led by military commanders.
D. It helped him get elected to public office.