A standard exam is a mixture of objective and subjective exams.
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The room is in a terrible mess; it ____________________(不可能是已经打扫过的).
Questions 11 to 18 are based on the conversation you have just heard.
A. She paid ￥40.00 for the coat.
B. Her husband presented it to her as a gift.
C. She bought the coat on her fortieth birthday.
D. Her friend sent it to her as a new one.
In a standard exam, you needn’ t answer all of the questions.
临床质控菌株在4℃、大豆酪蛋白消化液琼脂上保存，传代应
A. 每天一次
B. 每周一次
C. 每月一次
D. 每月两次
E. 每年一次
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