问题 解答题

制20节底面半径为5厘米、长为40厘米的圆柱形铁皮通风管,至少要用多大面积的铁皮?

答案

(3.14×5×2×40)×20,

=(3.14×400)×20,

=3.14×8000,

=25120(平方厘米);

答:至少要用25120平方厘米的铁皮.

单项选择题 B1型题
阅读理解

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。

﹡﹡(请把答案填涂在答题卡上   E="AB, " F="AC,  " G="AD" )﹡﹡

Duane Innes, an engineer, caused a car accident to save the life of driver Bill Pace.    1   But in Bill Pace’s case, Innes’ decision to put his own car in Pace’s path saved Pace’s life.

While Innes was driving his truck, he noticed Pace’s truck changing direction suddenly.   2  When he looked back at the driver, he saw that Pace lost consciousness(知觉) behind the wheel. The cars are approaching a busy crossroads, and Innes knew that Pace could be just a second from a dangerous collision(碰撞) with another car. He had to think fast.

   3   “If I could let him hit me, we could slow down together,” he thought. So Innes pulled up in front of Pace’s truck, and allowed it to hit his own car, bringing both trucks to a safe stop. Pace, a 70-year-old volunteer, had a heart attack a few days earlier and it caused him to lose his consciousness.   4  

After spending a week in the hospital for his heart disease, Pace is now doing well. “   5   He saved my life,” said Pace. Innes said, “If someone else heard this story and said, ‘Hey, it pays to do something good,’ then it’s all worth it.”

A.What a brave man Innes was!

B.Fortunately, Innes knew how to deal with it.

C.Duane Innes had to move his truck quickly to avoid getting hit.

D.Normally, if someone hits your car, you wouldn’t call him a hero.E. Old people with serious heart diseases had better not drive cars.

F. If Innes hadn’t blocked his truck, he would likely have died in a collision.

G. Duane Innes was injured badly and sent to hospital as soon as possible.