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