麻醉品每次处方注射剂不得超过
A. 3日常用量
B. 一次用量
C. 7日常用量
D. 4日常用量
E. 5日常用量
The author of this passage mentions "a road" in his introduction of the IP phones（）
A. to make it easier for the reader to understand the new technology
B. to imply that the phone calls are usually made on the road
C. because people usually would share a road with each other
D. because the road you are walking on is usually empty
Which of the following phrases in the fifth paragraph indicates the fridge's negative effect on the environment
A. "Hum away continuously".
B. "Climatically almost unnecessary".
C. "Artificially - cooled space".
D. "With mild temperatures".
The first volume was published（）
A. ten years ago
B. last year
C. five years ago
D. twenty years ago
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