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问题 选择题

非洲种植面积最广的粮食作物是（　　）

A．高粱

B．玉米

C．水稻

D．小麦

答案

非洲被称为“富饶大陆”，非洲热带草原面积很广，非洲种植面积最广的粮食作物是玉米．根据题意．

故选：B．

不定项选择

甲、乙两个原来不带电荷的物体相互摩擦（没有第三者参与），结果发现甲物体带了1.6×10 -15 C的电荷量（正电荷），下列说法正确的是    [ ]

A．乙物体也带了1.6×10-15 C的正电荷    

B．甲物体失去了104个电子    

C．乙物体失去了104个电子    

D．甲、乙两物体共失去了2×104个电子
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连线题

Look and write. 仿写句子。

例  

     My pencil case is below the desk.                                                                                               

1.

                                                                                                                                                   

2.

                                                                                                                                                   

3.

   

                                                                                                                                                   

4.

                                                                                                                                                   

5.  

                                                                                                                                                   

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