题目内容
（请给出正确答案）
What does the professor tell her students to do？
A．Transfer to the introductory class.
B．Write an essay about vitalism and mechanism.
C．Take an article home and read it.
D．Decide whether they are mechanists or vitalists.
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更多“What does the professor tell h…”相关的问题
A.It led to an innovative way of thinking and working.
B.It led to the proliferation of new applications, which were no longer limited to enterprise-related activities but digitized almost any activity in our lives.
C.It led to a new era for new media.
D.It led to a new era for creation.
A、125 - 134 KHz
B、13.56 MHz
C、433 MHz 860 - 960 MHz
D、2.45 GHz 5.8 GHz
A．a reverse ordering will help promote the development of the physical sciences
B．our knowledge of physical systems is more reliable than that of social systems
C．our understanding of the social system is approximately correct
D．we can investigate social phenomena better than physical phenomena
A．theories of its origin and history are varied
B．our knowledge of it is highly insecure
C．only a very small sample of it has been observed
D．few scientists are involved in the study of astronomy
A．machines
B．elements
C．systems
D．devices
[A] They enjoy more freedom and rights.
[B] They can spend their money as they like.
[C] Their relatives help them with childcare.
[D] They have all the power of the family.
[A] check emails
[B] chat with friends carefully
[C] send text messages
[D] make telephone calls
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.
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