问题
选择题
| 当光线从一种透明物体进入另一种物体时，下列说法正确的是（ ） A．光线的传播方向一定发生改变 B．当光线的传播方向有时不发生改变 C．当光线从水斜射入空气时，折射角小于入射角 D．当光线从玻璃斜射入空气时，入射角大于折射角 |
答案
答案：B
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| 当光线从一种透明物体进入另一种物体时，下列说法正确的是（ ） A．光线的传播方向一定发生改变 B．当光线的传播方向有时不发生改变 C．当光线从水斜射入空气时，折射角小于入射角 D．当光线从玻璃斜射入空气时，入射角大于折射角 |
答案：B
You want to run across the street to catch the bus which is leaving soon? But 1 ! You’d better not. If a policeman sees you, you’ll have to pay a fine (罚款). New traffic laws (交通法) say that 2 people cross the street when the light is red, they can be fined as much as 50 yuan. Traffic accidents 3 more than 104,000 people in China last year. Chinese cities have 4 cars than ever. Drivers and pedestrians (行人) must work together to make the streets 5 . The law has new rules for drivers and pedestrians. Drivers have to 6 down when they are close to crosswalks. If people are in a crosswalk, cars must 7 to let them pass. There are 8 for bus drivers, too. If bus drivers smoke, drink or make phone calls 9 driving, they can be fined. Buses that carry too many people are 10 against(违反)the law. Pedestrians will have to walk more safely under the new law. They must cross streets at crosswalks. Also, they shouldn’t climb over the fences (栅栏) 11 streets. Do you ride a bike to school? It’s not a good idea to 12 classmates on the back. You could be fined 50 yuan. And stay in the bike lane (慢车道) when you’re riding. The big roads are 13 cars and buses. If you see a hit-and –run (肇事逃逸), tell the police. They may give you a reward (奖赏). And don’t be 14 to help people to the hospital if they are hurt in an accident. Don’t worry about money. The new law says that 15 must take care of them even if they can’t pay right away.
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