Questions 19 to 21 are based on the conversation you have just heard.
A. They were responding to an oral interview.
B. They were making outlines of their essays.
C. They were answering several history questions.
D. They were evaluating each other’s answer.
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能力理论： 思维的灵活性是指在限定时间内产生观念数量的多少。
We are prepared to____________(采取武力) if negotiation failed.
胃穿孔（）
A. 肝浊音界下移
B. 肝浊音界上移
C. 肝浊音界消失
D. 肝浊音界增大
E. 肝浊音界缩小
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