问题 选择题

下列有关声现象的说法中,正确的是:[ ]

A.声波能传递信息,但不能传递能量

B.在公路和住宅区内设置屏障墙和种草、植树,这是在传播过程中减弱噪声

C.只要物体在振动,我们就一定能听到声音

D.两名宇航员在太空中能直接对话

答案

答案:B

A、声音可以传递信息和能量.故A错误.
B、在公路和住宅区内设置屏障墙和种草、植树,这是在传播过程中减弱噪声.故B正确.
C、物体在振动,能发出声音,若物体振动频率超出人的听觉频率范围,人耳不能感知.故C错误.
D、真空不能传声,所以宇航员在太空中不能直接对话,.故D错误.
故选:B.
阅读理解

阅读理解。

     Fear is an emotion like others such as happiness, anger, hurt, sadness. We need emotions to process

information we receive and decide how to respond. Being afraid of fast cars, for example, is something

that might protect us from harm Being afraid of the consequence of a choice may prevent us getting into

trouble.

     Fears in young children commonly center on certain animals like snakes or big dogs. Fears are caused

often because of experiences or ideas expressed by others, and at times, the media. Many normal fears

during the early years, like men with beards, or large dogs, disappear with age. Those relating to personal

failure and ridicule (嘲笑) remain through adulthood and may need special help to overcome.

     Children's fears are often small, but that doesn't mean they should be dismissed as trivial (微不足道的).

They need to be recognized and accepted as real for that child. Only when we help children understand their

fears can they grow normally in their ability to settle them.

     Research shows that as a child grows up, the center of his fears changes a lot. Things like divorce, a

teacher who "shouted at me", people with guns, bullies, big boys, or "making fun of me" top the list of

childhood fears.

     We cannot always prevent these experiences from happening, but it is essential that children be allowed

to freely express their emotions without judgment. Sympathy and a caring listener will help ease pain of these

fears. Read books and stories to your child about children who have experienced similar fears. This helps

children talk about their fears and find ways to cope. With all emotions, fears become less of a problem for

children as they gain self-confidence and they find that fear is normal and can be dealt with.

1. According to Paragraph 2, we can know that fears in young children _____. [ ]

A. only center on frightening animals

B. are not born but learned

C. can make sure of their safety

D. need special help to deal with

2. Children's fears are often ignored because _____. [ ]

A. they exist widely in the world

B. they will disappear with age

C. people thought they are not worth considering

D. they are often imaginary

3. In dealing with children's fears, the final goal of the parents is to _____. [ ]

A. stop unpleasant experiences happening to children

B. let children know about the nature of fear

C. create an environment where there is nothing to fear

D. develop children's ability to treat their fears on their own

4. From the passage we can learn that _____. [ ]

A. some childhood fears may have a lasting influence

B. children should avoid the media to reduce their fear

C. fears can be judged according to the environment

D. children with similar fears can communicate easily

5. What's the best title for this passage? [ ]

A. Children's fears.

B. How to overcome children's fears.

C. The kind of children's fears.

D. The bad effects of fears.

单项选择题