题目内容
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[主观题]
此处正确答案是[A]never[B]often[C]also[D]always
提问人：网友xykweb
发布时间：2022-01-07
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[A] Function of nap
[B] Nap and work
[ C] Nap and caffeine
[D] Nap and busy people
题目内容
（请给出正确答案）
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更多“此处正确答案是[A]never[B]often[C]also…”相关的问题
第3题
In the last paragraph, the author tells us that _____
A．difficulties are but part of everyone' s life.
B．depression and unhappiness are unavoidable in life.
C．everyone should learn to avoid trying, circumstances.
D．good feelings can contribute eventual academic excellence.
第5题
Why did the author say the House’s complaint was ridiculous？[A]The reasons it offers are largely insignificant [B]The Clinton-Nickles bill was too expensive． [C]Its tax cuts proposal is even more costly． [D]The estimated cost for the bill iS Just$5 billion．
第8题
PART C
Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE.
听力原文： Balloons consist of a large flexible bag containing either hot-air or the gas that is lighter than air. The bag no neither envelope is made of silk, rubber or other suitable materials. Piloted balloons carry one or more persons; unpiloted balloons are usually used for scientific research and carry instruments to measure and record a variety of physical phenomena. Since the first successful manned balloon flied in 1783, hot-air balloons have been flown primarily for pleasure. Although the military made extensive use of them in World War I, occasionally rised for sport, the colorful globes are a more commonly thing flying in the sky during the summer when visibility is high and the flights are generally peaceful. Any gas that is lighter than air can be used to lift the balloon. Natural gas, heated air and manufactured gas can and have been used to fly balloons. The earliest balloons were filled with hot-air and often carried a metal container for burning coal to continuously heat the air. Modern balloons are usually filled with hydrogen or air heated by a small gas burner. Balloons are used primarily for two purposes, sport or scientific research. Sport balloons mostly use hot-air, they range from 10 to 20 meters in size when the bag's inflated; scientific balloons generally use hydrogen and some particular gases. They range in size from 30 to 200 meters when fully inflated.
Questions:
11. The common use of unpiloted balloons is______
12. Why do people usually fly hot-air balloons in summer？
13. What enabled the earliest balloons to fly？
(11)
A．for military purposes.
B．for pleasure.
C．for scientific research.
D．for sports.
