检验绿叶在光下是否产生淀粉,所用的试剂是[ ]
A.生理盐水
B.酒精
C.清水
D.碘液
答案:D
Choose and correct. 选出错误的选项并把正确的写在横线上。
( )1. The bird live in the tree.
A B C D
( )2. My brother likes playing the football.
( )3. She likes collecting stamp.
( )4. Does he goes to school by bus?
( )5. He plays basketball in weekends.
常见的间歇运动机构有棘轮机构、()机构、()机构等。