单项选择题
The phrase "coincided with" in the first sentence of Para. 2 is closest in meaning to ______.
A.was influenced by
B.happened at the same time as
C.began to grow rapidly
D.ensured the success of
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单项选择题
What does the passage mainly discuss
A.The equipment divers use.
B.The effects of pressure on gases in the human body.
C.How to prepare for a deep dive.
D.The symptoms of nitrogen bubbles in the bloodstream.
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单项选择题
The word diffuses in Para. 3 is closest in meaning to ______.
A.yields
B.starts
C.surfaces
D.travels
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