急性肺水肿病人采取坐位.双腿下垂，目的是（）
A.病人不能平卧
B.促进呼吸
C.减少静脉回流
D.防止肺栓塞
E.预防脑水肿
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.
下列关于分子的叙述，错误的是[ ]
A.分子在化学变化中不可再分
B.分子呈电中性
C.分子之间有空隙
D.分子由原子构成
