小儿断奶时间宜在()。
A.2~3个月
B.4~5个月
C.6~7个月
D.8~12个月
E.13~18个月
参考答案:D
— You've been driving for hours. Shall I _____?
— No, that's OK. I enjoy driving and I know you hate it, especially on the highway. [ ]
A. take back
B. take on
C. take over
D. take up
电视塔的观测点不得少于()个点。
A.1
B.2
C.3
D.4