题目内容

More than one example ______ necessary to make the students understand this rule clearly．

A. should be
B. is
C. are
D. have been

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In England, people put their ______ first.

A. given names
B. full names
C. family names
D. English names

The trouble with such resources as coal，oil and gas ______ that they are not renewable．

A. has been
B. are
C. have been
D. is

维生素C注射剂的正常情况下的颜色和性状是

A. 无色澄明液体
B. 红色浑浊液体
C. 棕色澄明液体
D. 黄色澄明液体
E. 无色浑浊液体

可降低因化疗药物而引起的白细胞降低可用何中药

A. 大黄
B. 黄连
C. 黄精
D. 黄柏
E. 黄芪