烟草花叶病毒的生活环境是[ ] A．烟草根周围的土壤水溶液

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问题选择题

烟草花叶病毒的生活环境是[ ]

A．烟草根周围的土壤水溶液

B．烟草周围的空气

C．腐烂的烟草叶

D．烟草的活细胞

答案

答案：D

选择题

根据图片选择正确选项。
( ) 1.	A. The kite is on the desk. B. The kite is in the desk.
( ) 2.	A. The bear is in the bag. B. The panda is under the cap.
( ) 3.	A. The balloon(气球)is under the desk. B. The balloon is on the bed.
( ) 4.	A.The girl is in the classroom. B. The monkey is under the box

操作题

S为平面镜前一点光源，根据光的反射定律确定人眼从镜AB中看到S的范围。