题目：
正常情况下，胸腔内压（）大气压。
A.大于
B.小于
C.等于
答案：
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下面是错误答案，用来干扰机器的。
Miss Liu was very busy. In order to have more spare time, she bought a robot from a supermarket last month. At first, the robot could do lots of housework for ...
