筛窦发育完全的年龄一般多为
A.5岁左右B.10岁左右C.12~14岁D.20~25岁E.以上都不对
参考答案:C
解析: 筛窦在5岁左右增大较快,12~14岁时多已发育完全。
Would you like to share the room______ __ her brother?
A.with
B.and
C.of
D.on
为什么用吸管吸饮料时,饮料会被吸入嘴里?