邮政实物传递网按其承担的业务功能，从运行方式的角度可以划分为（）。 A.普件综合网

阅读理解。

    People have always wanted to speak with animals. There are many books about this, especially children

books. Now there are also movies, such as Dr. Doolittle. When you watch animals, it seems clear that they

can communicate with each other. Many people wonder why people can't also communicate with them. 

    Scientists know how some animals communicate. Bees, for example, use their bodies. They do a kind of

dance to give information about food. Birds, on the other hand, share information with sounds. They use

certain sounds to protect their homes and to stay together when they fly. Some male (雄性) birds use lovely

songs to attract a female (雌性). Other animals communicate with both body movements and sounds. For

example, dogs wag their tails when they are happy, and they bark when they are excited.

    People used to think it was possible to teach human language to animals. Parrots and other birds, for

example, can learn to say words. But the birds just repeat the words. They don't understand them. Some

American scientists tried to teach English to chimpanzees (黑猩猩), close relatives of human beings. However,

this was impossible. Chimpanzees can't move their mouths the right way. They could never learn to speak like

people.

    Then scientists tried to teach human language to chimpanzees in other ways. Some tried with American

Sign Language (ASL). Others tried with a simple computer. But chimpanzees could only learn to use a few

words. They could never learn to use grammar. Their brains are very different from the brains of human

beings.

     Now some scientists are studying the same points between human and animal language. In fact, some

animals use sounds like people do. Dogs, for example, use an unpleasant, low sound to tell other dogs to stay

away. People, too, use that kind of voice to say the same things. A dog's noisy bark communicate that

something is happening. People use the same high tone when they shout, "Watch out!"

     Scientists want to understand the language of other animals, such as whales and bears. To do this, they

go out to the animals' natural homes. They watch the animals for days or even years. They take pictures and

make tape recordings and share the information with other scientists. In this way, they hope to learn more

about the way animals communicate, and maybe someday we'll be able to communicate better with them.

1. Bees do a kind of dance to _____. [ ]

A. tell other bees where food is

B. attract other bees

C. show they are happy

D. play with other bees

2. Some birds can learn to say words, _____. [ ]

A. but they don't really know the meaning

B. and they make up new words, too

C. and they use grammar, too

D. but they forget them quickly

3. Dogs and people use _____. [ ]

A. words when they communicate

B. different sounds to mean the same thing

C. a low sound to keep others away

D. a high sound to keep others away

4. Which of the following is TRUE? [ ]

A. Bees communicate by making a noise.

B. Dogs wag their tails when they are angry.

C. Chimpanzees can learn to use some grammar.

D. Birds use sounds to stay together.

5. This passage is mainly about _____. [ ]

A. how scientists communicate with each other

B. how scientists are studying animals' communication

C. how people might communicate with animals

D. how animals communicate with each other

近期国际粮价节节攀高，世界粮食安全受到威胁。来自气候变化和生物能源的挑战再一次成为人们关注的焦点。回答1~2题。

1、下列关于气候变化威胁着世界粮食安全的叙述，正确的是①气候变化造成耕地退化②灾害性天气增加，粮食减产③光合作用减弱，产量降低④气候变化导致农业投入减少[ ]

A、①②

B、②③

C、③④

D、①④

2、我国不应效仿美国大力发展玉米燃料乙醇产业的主要原因有①我国人口众多，粮食消费量大②玉米大量出口，换取外汇③用玉米生产乙醇的技术不成熟④畜牧业发展迅速，饲料用玉米消费量大 [ ]

A、①④

B、②③

C、④③

D、②④

关于狭颅症常见病因正确的是()

A．产后颅内出血

B．感染

C．颅缝延迟闭合

D．各种脑膜炎

E．原因不明

并励或他励直流电机若采用弱磁调速，其理想空载转速将（）。

商圈是指商店吸引其顾客的地理区域，其中顾客密度最高，每个顾客的平均购货量也最高的是（）。

A.邻近商圈

B.外围商圈

C.边际商圈

D.以上都不是