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%
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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
预期投资若超过预期储蓄,那么()。
A. 总供给将大于总需求
B. 在未充分就业情况下将增加就业
C. 将产生通货膨胀缺口
D. 经济将处于非预期状态