题目内容

This was the first time______I had serious trouble with my boss.

A. since
B. that
C. which
D. when

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2009年世界液化天然气贸易量占天然气贸易总量的比重为()。

A. 17．5％
B. 22.20%
C. 27.70%
D. 38.30%

表格中？处应为()。

A. 1598.1
B. 1902
C. 1700
D. 14281

Clothing made of man-made fibers has certain advantages over______made of natural fibers like cotton, wool or silk.

A. one
B. that
C. which
D. what

Cars play an important role in modern life, but they______also cause many problems like air pollution.

A. can
B. should
C. would
D. need