单项选择题

Which of the following is closest in meaning to the underlined word"surged"(in Para.3)（）

A. Improved
B. Failed
C. Increased
D. Decreased

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单项选择题
Different from fish, dolphins （）.

A. live on land. B. breathe with lungs.
C. breathe under water.
D. live without oxygen.
单项选择题
33（）

A. behind
B. for
C. off
D. out
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