你能用普通计时法写出下面节目的播出时间吗？ 9：00夕阳红（） 16：30大风车

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。请将答案填在第II卷所给的相应序号的空白处

Keep safe in storms

In the spring and summer months, thunderstorms(雷雨) are common. _____小题1:____. In thunderstorms, lighting can strike(击中) people and buildings and is very dangerous.

It was reported that a man was struck by lighting when he was making a phone call under a tree. He died at once. You may not know it, but nearly 1,800 thunderstorms are happening at any moment around the world.______ 小题2:____.

So what should you do during a lighting storm? Scientists say that a person’s chances of being struck by lighting are 1 in 600,000. ____小题3:____

If you are indoors during a thunderstorm:

Stay away from anything that is metal because lighting can come into the house through it.

Don’t stand near the windows.

Don’t take a shower or bath. Lighting can travel through water.

Never use the phone.____ 小题4:______.

If you are caught in a thunderstorm outdoors:

_____小题5:_____. If there’s no building around, try to find a low place to stay in.

Do not go under a tree because the lighting could hit the tree and travel through the tree to hit you.

Never use a cell phone.

A．But you can reduce those chances by following these safety rules.

B．But it is very important for us to learn about lighting.

C．Lighting could travel through the phone line and hit you

D．In fact, many people are killed by lighting every year.E. Try to get home as soon as possible.

F. Since they happen often, some people don’t take them seriously.

G. Go into a nearby building or car right away.

如图，有三个质量相等、分别带正电、负电和不带电的粒子从两水平放置的金属板左侧中央以相同水平初速度先后射入电场中，最后分别打在正极板A、B、C 处，则：（     ）

A．三种粒子在电场中运动时间相同　　

B．三种粒子到达正极板时动能

C．三种粒子在电场中的加速度为

D．落在C 处的粒子带负电，落在B 处的粒子不带电，落在A 处粒子带正电

关于友元的概念错误的是（ ）。

A．If x>=y Then z=x：z=y

B．If x>=y Then z=x Else z=y

C．z=y：If x>=y Then z=x

D．If x<=y Then z=y Else z=x

机械能是能量的一种．在机械能的表现形式中，由于运动而具有的能叫______能，由于发生______而具有的能叫弹性势能．扩散现象说明分子在永不停息运动，一种与热运动有关的能量叫______能．

掘进机司机离开操作台时，必须（）掘进机上的电源开关。