What does Norman want his children to do?
A. To relieve their mom of the housework burden.
B. To help their mom out when emergency happens.
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Why does Little Brad do the clowning?
A. Because he wants to make his brother laugh.
Because he can't control it.
What do the Customer's words mean before she provides the suggestion?
A. It means that she doesn't want Mrs. Cohen to fully understand her.
B. It means that she doesn't want Mrs. Cohen to misunderstand her.
电动汽车真空助力系统在传统真空助力系统的基础上增加了电动真空泵，来产生足够的真空度，从而实现助力。
A. 对
B. 错
电动汽车上的真空源来自于汽油发动机的进气歧管。
A. 对
B. 错
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