There is ________ on TV this evening.
A. nothing interesting
B. anything interesting
C. interesting anything
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The writer went to the beach every day last summer because _______.
A. he enjoys swimming
B. he enjoys traveling
C. he worked there
注射剂中的热原不能够以下列哪种方式 被破坏
A. 强酸
B. 强氧化剂
C. 加热
D. 超声波
E. 以上答案都不行
长期平均成本曲线为U型的原因与( )有关。
A. 固定成本与可变成本所占比重
B. 要素的边际生产率
C. 规模报酬
D. 外部经济与外部不经济
Lucy never goes swimming with her parents, ________
A. doesn't she
B. does she
C. does Lucy