问题 单项选择题

下列关于下表为某河流生态系统从生产者开始的四个营养级的年能流量。其中属于次级消费者的是()

A.a

B.b

C.c

D.d

答案

参考答案:B

解析:

由于生态系统的能量流动具有逐级递减的特点,所以由图表可知,c为生产者a为初级消费者b为次级消费者d为三级消费者,故本题选B。

考点:生态系统的能量流动

点评:本题考查了学生的分析能力,难度适中,解题的关键是理解生态系统的能量流动具有逐级递减的特点。

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    Safety in thehighway is not totally out of hands. Here are four

ways we canprotect ourselves when we travel.

    You are safer in a  large car. People in small cars are

injured more often and more severely than  people traveling in

large cars. Factories of small cars are strengthening their

products' safety, which helps. But the mix of large cars and

small cars on the road is the main reason of the problem.

       Being thrown into glass and metal car parts, or being

thrown from the car, can really damage to you. That's why

safety belts should be worn. The safety belt's main purpose is

       if your car has a sudden crash with another vehicle or

object, or if it rolls over. A belt can reduce the chance of fatal

injury by 45% and the chance of serious injury by 50%.

     Air bags are important. More than half of all new cars sold

have air bags. Air bags provide protection in frontal ( 正面的)

crashes-the type of crash that kills the most drivers-

when they are also wearing safety belts. Most people are

demanding air bags in the cars they buy. But the protection

provided by air bags is limited in side or rear crashes; effective

as they are, they can't take the place of safety belts.

      Drunk driving crashes are less likely to happen if you don't

drink. Drunk driving is the most serious problem. Many people

have realized that drunk driving can lead to death and injury,

prison time and other results. There are movements to

strengthen penalties ( 处罚) for drinking and driving.

1. What is the main idea of the passage? (Please answer within 10 words. )

__________________________________________________________________

2. Which of the sentences in the passage can be replaced by the following one? 

     Although they are effective, you should still wear your  safety belts while driving.

__________________________________________________________________

3. Please fill in the blank with proper words to make the sentence completed.

    (Please answer within 6 words. )

___________________________________________________________________

4. Please translate the underlined sentence into Chinese.

___________________________________________________________________

5. What other suggestions can you offer? Why? (Please answer within 30 words. )

___________________________________________________________________