“国际旅行健康检查证明书”的有效期为( )。
A.3个月
B.6个月
C.9个月
D.12个月
参考答案:D
_______ the same mistake again made his parents unhappy; ______ by his parents, he left ______ .
A.His being made; criticizing; disappointed
B.He has made; criticized; disappointed
C.He had made; criticized; disappointing
D.His making; criticized; disappointed
在近代中国的社会生活中不可能出现的现象是[ ]
A.看电影照相
B.坐火车、汽车出行
C.拍电影打电话
D.用电脑上网聊天