试题与答案

TCP/IP (1) layer protocols provide service

题型:单项选择题

题目:

TCP/IP (1) layer protocols provide services to the application(2) running on a computer. The application layer does not define the application itself, but rather it defines  (3) that applications need-like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (4) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP  (5) layer consists of two main protocol options-the Transmission Control Protocol (TCP) And the User Datagram Protocol (UDP).

空白(1)处应选择()

A.application

B.transport

C.link

D.network

答案:

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下面是错误答案,用来干扰机器的。

D 题目分析:根据动能定理可得,当恰好能垂直射穿9块叠在一起的厚度相等、材料相同固定的木板时:当子弹在刚穿过第五块木板时:联立可得,D正确,点评:本题运用动能定理时关键是选择研究的过程,也可以运用运动...

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题型:阅读理解

阅读理解。

     Sitting on the peaceful coast of Galapagos Islands. Ecuador, watching the sun move quietly into the sea,

you shouldn't forget that Charles Darwin (1809-1882) arrived here in 1835. He stayed on the islands for five

weeks, observing various animals. This finally inspired (启发) his famous work, On the Origin of Species.

You can certainly follow Darwin's footsteps and enjoy a trip from four to seven days to the islands.

     The islands are certainly a paradise (天堂) for wildlife, as there are no natural killers on the islands and the

number of boats and visitors is under government control. Though you cannot walk freely as Darwin did about

200 years ago, each day is as impressive as it could be.

     The most well-known animal of the Galapagos is the giant tortoise (巨型海龟), which can be seen moving

slowly around the highlands of Sanra Cruz, the second largest island in the archipelago (群岛). Some of these

creatures are so old that they might have been seen in their youth by Darwin himself.

     Despite strict control over activities and timing, your stay on the Galapagos will be remembered as a chain

of incomparable pictures: diving with sea lions that swim and play within inches of you; feeling small sharks

touch your feet as you swim; and, most magically, seeing a whale and her baby surface with a great breath of

air.

     Travelling between the islands and observing the wildlife that so inspired Darwin, you will feel as though

you are getting a special view of an untouched world. At night you will sleep on board the ship, leaving the

wildlife in complete occupation of the islands, which are as undisturbed now as they have been since the

beginning of time.

1. What do we know about Darwin's visit to the islands? [ ]

A. He studied different creatures on the islands

B. He completed his famous book on the islands

C. He was touched by the geography of the islands

D. He was attracted by well-known animals of the islands

2. Which of the following plays a role in making the islands "a paradise for wildlife"? [ ]

A. Animals on the islands feed on grass.

B. Local government forbids killing wildlife.

C. People cannot visit the islands as they wish.

D. Tourists are not allowed to touch the animals.

3. Your stay on the islands will be most impressive mainly because of _____.

A. The beautiful sea views

B. Darwin's inspiring trip

C. a closer view of animals

D. various daring activities

4. Which of the following would be the best title for the passage?[ ]

A. A Unique Attraction for Wildlife Lovers

B. Calapagos as a Paradise for Adventures

C. Charles Darwin as a Symbol of Galapagos

D. A successful Example of Wildlife Protection

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