术后病人出现恶心、呕吐最常见的原因是（）
A.伤口疼痛
B.腹胀
C.麻醉反应
D.肠蠕动增强
E.发热
参考答案：C
He ______ go out with his parents, but now he ______ staying at home alone.[ ]
A. used to, is used to
B. is used to, used to
C. use to, is used to
油温不大于（）℃，正常值（）℃。
