题目内容

Blue whales are the largest _________ ever to have lived.

A. fish
B. creatures
C. primates
D. siren

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He planned to _________ his directorship next year because of his young age.

A. run for
B. retire from
C. choose
D. resign

Mozart is dead but his music _________.

A. disappeared
B. lives on
C. vanished
D. lost

The policy of _ pay for _ work has been in place in China for over 50 years.

A. equal, equal
B. more, less
C. less, more
D. equa, less

Oil is an important _____ material, which can be processed into many different chemical products, including plastics.

A. primary
B. raw
C. original
D. critical