患儿，2岁。半年来经常泄泻，形神疲惫，面色萎黄，大便稀薄，四

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问题单项选择题 A2型题

患儿，2岁。半年来经常泄泻，形神疲惫，面色萎黄，大便稀薄，四肢不温，时有抽搐。其证候是（）。

A.外感惊风

B.痰食惊风

C.脾肾阳虚

D.土虚木亢

E.阴虚风动

答案

参考答案：D

解答题

（本小题满分14分）已知数列{a_n}的前n项和为S_n，且a_n是S_n与2的等差中项，数列{b_n}中，b₁=1，点P（b_n，b_n+₁）在直线x-y+2=0上。

（1）求a₁和a₂的值；（2）求数列{a_n}，{b_n}的通项a_n和b_n；

选择题

—I came to your office yesterday morning, but nobody was in.

—Oh, we ________ a meeting in the meeting room. [ ]

A. have had

B. had

C. were having

D. had had