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问题 单项选择题

56，73， 129，202， ( )。

A．331

B．269

C．325

D．304

答案

参考答案：A

解析：
本题为和数列。56+73=129，73+129=202，即an+2=an+an+1，故第五项为129+202=331。

问答题

所谓“母大儿肥”是说植物营养生长越旺盛则其生殖器官产量越高，请从营养生长与生殖生长的关系方面加以说明此说法是否全面？
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单项选择题

Woman: Have you heard about the plane crash yesterday It caused 120 deaths. I’m never at ease when taking a flight.
Man: Though we often hear about air crashes and serious casualties, flying is still one of the safest ways to travel.
Question: What do we learn from this conversation（）。

A. The man thinks travelling by air is quite safe.

B. The woman never travels by plane.

C. Both speakers feel nervous when flying.

D. The speakers feel sad about the serious loss of life.
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