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问题 选择题

读“美国部分地区轮廓图”，完成1～2题

1．图中a、b、c、d、e五区域中，属于商品谷物农业地域类型的是[ ]

A．a、b

B．c、e

C．a、d

D．b、e

2．与中国三江平原相比，美国商品谷物农业在生产上的最突出优势是[ ]

A．工业可以为农业提供所需农机具

B．有五大湖及密西西比河的航运

C．地广人稀，可以进行大规模机械化的生产

D．科技发达，政府投入较多

答案

1、C

2、D

单项选择题

屋架下弦截面为120mm×200mm，木料为马尾松，下弦接头处N=90kN，屋架下弦用双剪连接。螺栓连接承载力的计算系数Kv=6.1，若螺栓采用20的螺栓，试问接头处接头所需的最少螺栓数目为（）。

A．3

B．5

C．4

D．6
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完形填空

How can we students keep ourselves safe? Here are some t  小题1: .

On your way home or to school: W  小题2: for the green traffic light, and look left and right before you cross the road. If you see a car coming, don’t cross until it is really safe. Dress in bright colours, so the drivers can see you c 小题3: .

At school: When students around you begin to push, try to hold onto something, or stay in a safer corner. If you fall down in a crowded（拥挤的）place, cover your head with b 小题4:  hands.

When there’s a fire: Stay c  小题5: and leave quickly. Use a piece of wet cloth to cover your mouth and nose so that you don’t take in s  小题6: . If your clothes catch fire, please drop to the ground and roll from side to side to put out the fire.

For eating: Wash fruit like apples or g  小题7:carefully before you eat them. Check the expiration dates（保质期）and if your food looks or smells t 小题8: , don’t eat it.

For riding on the escalator（自动扶梯）: Hold onto the handrails（扶手）. It is d 小题9:  to run up and down on them. You may fall down because escalator steps（台阶）are not fit for

r  小题10: .
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