问题
单项选择题
关于电击，下列说法不正确的是（）
A.低频交流电危害性较高频交流电高
B.交流电危害性较直流电大
C.电流能量可转化为热能，引起灼伤
D.雷击常见于农村旷野
E.中枢神经系统即使接触较小电流，也可引起神经阻断
答案
参考答案：A
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关于电击，下列说法不正确的是（）
A.低频交流电危害性较高频交流电高
B.交流电危害性较直流电大
C.电流能量可转化为热能，引起灼伤
D.雷击常见于农村旷野
E.中枢神经系统即使接触较小电流，也可引起神经阻断
参考答案：A
| 阅读短文，选择正确答案。 | |
| This is Mr Black's family. Mr Black has two sons and a daughter. They also have a pet (宠物) dog. They have a big house. Their house has two bathrooms, four bedrooms, a kitchen and two other rooms. They have a small but nice garden. There are many beautiful flowers and some green grass in it. And there are three tall trees near their house. They have two cars. On Saturday and Sunday they often go to the seaside (海滩) in their cars. Mr and Mrs Black work five days a week. They are teachers. They help their students. They also help their sons and daughter with their lessons. | |
| 1. Mr and Mrs Black make a nice for their children. | |
[ ] | |
| A. house B. seaside C. family D. room | |
| 2. There are rooms in the big house. | |
[ ] | |
| A. 3 B. 9 C. 10 D. 8 | |
| 3. They often go out by . | |
[ ] | |
| A. bike B. bus C. car D. train | |
| 4. They may often in their garden when they are free. | |
A. play football B. ride bikes C. water flowers and trees D. borrow books | |
| 5. Their children may . | |
[ ] | |
| A. be students at school B. work in a school C. do housework at home only D. do nothing |