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提问人：网友Alexis1412
发布时间：2022-01-06
[单选题]
A．monthsB．weeksC．hoursD．times
A.months
B.weeks
C.hours
D.times
参考答案
| ___experiment took us five months and turned out__great success. |
[ ] |
| A. The; / B. /; a C. The; a D. The ; the |
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更多“A．monthsB．weeksC．hoursD．times”相关的问题
第1题
第2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4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7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.
第8题
When did the Congress approve a bill to declare Labor Day a national holiday？
A．1883.
B．1882.
C．1894.
D．1899.
第9题
The money most American firms spend in training mainly goes to ______.
A．workers who can operate new equipment
B．technological and managerial staff
C．workers who lack basic background skills
D．top executives
第10题
The money which enables these companies to go ahead with their projects is ______.
A．repaid to its original owners as soon as possible
B．raised by the selling of shares in the companies
C．exchanged for part ownership in The Stock Exchange
D．invested in different companies on The Stock Exchange
