判断题

沸点是指当液态物质受热时，液体的蒸气压增大到与外界施加到液面的总压力相等时，就会有大量气泡从液体内部逸出，即液体沸腾，此时的温度即为液体在该大气压下的沸点。
正确错误

答案：正确

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单项选择题

在螺帽或螺栓上进行保险操作时，起点应选在
A、最容易操作的位置
B、最难操作的位置
C、没有特殊的要求

Questions 5 to 8 are based on the conversation you have just heard.
A、A) She was too young to know cultural differences.
B、B) She didn’t have manners for talking to adults.
C、C) She couldn’t get along well with other children.
D、D) She wanted to play outdoors with her friend.

答案： Old friends.