从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性（）
A．
B．
C．
D．
参考答案：C
用画线单词的反义词填空。
1. Miss Liu is young. Miss Yang is _____________.
2. My English teacher has long hair. My P. E. teacher has _____________ hair.
3. My music teacher has a small nose and two _____________ eyes. She's very beautiful.
4. Mr Wang is a _____________ man, but Mr Zhang is a thin man.
流行性出血热发生腹痛的机制是（）
A.肠系膜血管栓塞
B.肠管痉挛
C.肠黏膜出血坏死
D.肠黏膜炎症
E.肠系膜局部极度充血水肿
