题目内容
（请给出正确答案）
According to the speaker, what kind of problems do phrase books have？
A．They are actually useless.
B．They have a practical problem.
C．They should be disigned in more phrases.
D．They don't provide enough useful phrases.
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更多“According to the speaker, what…”相关的问题
A、responde
B、answered
C、returne
D、remarked
A、rational thinking
B、deep understanding of natural law
C、scientific thinking
D、scientific experiments
A、His experiment shows that people just couldn’t bear to see their options vanish.
B、His experiment shows that people always want to keep all the doors open.
C、His experiment shows that people are fond of playing games.
D、His experiment shows that people do not bother to bring with them the key to the door.
A、The variety of nationalities, religious groups and cultural orientations there.
B、The values reflected by the education systems there.
C、The students expressing their own ideas in class discussion.
D、The students variety choices
A、beautify the environment
B、store and purify water
C、clean up pollution
D、provide medicine and food
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.
Many said "No way. Rain would wash the black powder from the atmosphere. But in America, air sampling balloons have detected high concentrations of particles similar to those that were collected in Kuwait. Some oil didn't catch fire. It has formed huge lakes in the Kuwaiti desert. They trap insects and birds, and poison a variety of other desert animals and plants.
The only good news is that the oil lakes have not affected the underground water resources. So far, the oil has not been absorbed because of the hard sand just below the surface.
Nothing, however, stops the oil from evaporating. The resulting poisonous gases are choking nearby residents. Officials are trying to organize a quick cleanup, but they are not sure how to do it. One possibility is to burn the oil. Get those black-powder detectors ready.
The consequence of the Gulf War that has called the concerns of the scientists is ______.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the rims.
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