This is my son. ______ name is Yang Yang. [ ]
A. He
B. She
C. His
D. Her
答案：C
单项选择
-How many____ are there over there?
-There are fifty.[ ]
A. student
B. sheep
C. boy
D. girl
在配制一定物质的量浓度的溶液时，不会用到的仪器是 [ ]
A．烧杯
B．烧瓶
C．容量瓶
D．玻璃棒
