用水尺进行水位观测时，应每隔（）观测一次，整点时必须观测。
A、20min
B、30min
C、15min
D、10min
参考答案：B
看图，判断对“√”错“×”。
( ) 1. Are they his shorts?
( ) 2. Whose dress is this?
( ) 3. They are my shoes.
具有强心作用的消食药是（）
A.麦芽
B.莱菔子
C.山楂
D.谷芽
E.神曲
Are they his shorts? 
Whose dress is this? 
They are my shoes.