The Browns are from England. They live in New York. Mr. Brown is a doctor. Mrs. Brown doesn’t work. She has a lot of housework to do every day. They have two sons. Bob is ten years old and Tom is eight years old. They are students. Bob doesn’t want to be a doctor but Tom does. Bob wants to be a pilot（飞行员）. Their daughter, Molly, doesn’t go to school. She is only four years old. Molly wants to be a teacher.

小题1:Do the Browns live in America now?

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小题2:What does Mr. Brown do?

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小题3:How many people are there in Brown’s family?

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如图5-42所示，简支梁中的最大剪力和最大弯矩值分别为（）。

A．A

B．B

C．C

D．D