问题 选择题

下列事例中,不能说明生物能对环境产生影响的是(  )

A.破坏植被会使草原沙漠化

B.草原上有一定数量的狼,野兔就不会太多,有利于草的生长

C.海洋中的藻类大量繁殖会造成赤潮使海水的含氧量降低

D.南极生物种类和数量都较少

答案

生物必须适应环境才能生存,如沙漠上的植物必须耐旱才能生存.生物也能影响环境如蚯蚓改良土壤,千里之堤毁于蚁穴,植物的蒸腾作用可以增加空气湿度等.

A、破坏植被会使草原沙漠化,是植物对环境的影响,体现了生物对环境的影响,故不符合题意;

B、草原上有一定数量的狼,野兔就不会太多,有利于草的生长,体现了生物对环境的影响,故不不符合题意;

C、海洋中的藻类大量繁殖会造成赤潮使海水的含氧量降低,体现了藻类对环境水的影响,故不符合题意;

D、南极生物种类和数量都较少,是生物对冬季寒冷环境的一种适应.故符合题意.

故选:D.

阅读理解

阅读理解。

     Would you know what to do during a big earthquake (地震)? Scientists have some advice for us.

     If the ground begins shaking while you are driving, stop your car on the roadside and stay in it. If you are

in a tall building, don't use the lift and never jump out of the windows. When you are in a living room, find a

strong table or rush into a smaller room like washroom. Then lie down your body. Take care of your head.

When you are in a public place, like supermarket or cinema, don't crowd in jam (拥挤), or you may fall over

and get hurt. Cross your arms to protect yourself. You can also find a place to hide.

     After the main shake, quickly run out of the dangerous building for there will be small earthquakes. If you

are safe, remember not to engage the phone line, keep it free for rescue (援救) using. Don't go to the hospital

if you are not badly hurt, others will really need help. Take part in the rescue action if you can.

1. Who give readers the advice above?

A. Doctors.

B. Scientists.

C. Teachers.

D. Parents.

2. What should people do if they are driving when an earthquake happens?

A. Drive on quickly.

B. Take care of the car.

C. Stop the car on the roadside.

D. Jump out of the windows. 

3. Why does the writer say "Don't crowd in jam in public places"?

A. Because people can lie down easily.

B. Because people may get help quickly.

C. Because it can help avoid falling over.

D. Because it can help find a place to hide.

4. What does the underlined word "engage" in the last paragraph mean in Chinese?

A. 占用

B. 触摸

C. 接通

D. 修理

5. Which of the following is TRUE according to the last paragraph?

A. Try to help the others if you can.

B. Stay in the dangerous building after the main shake.

C. Go to a doctor even though you are not badly hurt.

D. Keep making phone calls to tell your family that you are safe.

单项选择题