题目内容
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Astronomers are still learning about sunspots and about their effects on us, but believe that the spots on the sun, which were first observed through a telescope by Galileo in 1610, are electrical in nature.
Sunspots vary in size from what appear to be small specks on the sun's surface, to at least 90,000 miles long, and 200,000 miles in length, and are visible on most clear days.
When sunspots release their electrical energy, they shoot beams of negatively charged electrons into space, some of which escape into the Earth's atmosphere. These electrons create electrical effects, such as the aurora borealis, or Northern Lights, cause the disruption of radio transmissions, and increase the amount of ozone in the upper atmosphere. The additional ozone may absorb more than the usual amount of the sun's heat, which in turn may affect our weather.
The sunspot cycle, is a recurring 11-year period over which the number of sunspots fluctuates and corresponds to the number of sun flares. An increase in the number of sun flares leads to an increase in the number of sunspots, and a decrease in the number of sun flares leads to a decrease in the number of sunspots,
Records of sunspots have only been kept for the last 100 years or so, leaving astronomers with little to back their research and much yet to discover about this phenomenon.
(27)
查看答案
搜索结果不匹配？点我反馈
更多问题
听力原文： Many children first learn the value of money by receiving an allowance. The purpose is to let children learn from experience at an age when financial mistakes are not very costly.
The amount of money that parents give to their children to spend as they wish differs from family to family. Timing is another consideration. Some children get a weekly allowance. Others get a monthly allowance.
In any case, parents should make clear what, if anything, the child is expected to pay for with the money.
Young children may spend all of their allowance soon after they receive it. If they do this, they will learn the hard way that spending must be done within a budget. Parents are usually advised not to offer more money until the next allowance.
Though jobs at home for young children are a normal part of family life, paying children to do extra work around the house can be useful. It can even provide an understanding of how a business works.
Allowances give children a chance to experience the three things they can do with money. They can share it in the form. of gifts or giving to a good cause. They can spend it by buying things they want. Or they can save it.
Saving helps children understand that costly goals require sacrifice: You have to cut costs and plan for the future.
(30)
听力原文：M: Mrs. Smith, I found two leaks in my bedroom ceiling during the storm last night.
W: I'm sorry for that, but never mind, I know a reliable roofing company, i promise your problem will be dealt with as soon as possible.
Q: What do we learn about the conversation？
(18)
听力原文： Recent films, books, magazines and newspapers have reported about serious threats to the environment. Changes in climate, increasing pollution, rising energy demands, and decreasing supplies of water are worldwide problems. Designers and builders around the world are reacting to these environmental concerns with new conception of green house.
Green houses are designed to be sustainable. Something that is sustainable provides people today with what they need. But it does not use up or damage the natural resources.
Green houses use much less fossil fuels—oil, gas and coal—for energy. The houses are placed on the land so the sun warms them during cold months and is blocked during hot months. The houses have plenty of windows that open to let in cooling air. They have special equipment that uses a lot less water.
Green houses are made of wood from fast-growing trees so old growth forests do not have to be cut. They include recycled materials so something old is re-used, not thrown away as waste. The houses are healthier for people to live in. Materials used in them are not processed with strong chemicals that can produce harmful gases.
Houses that are environmentally friendly are not new. For years, architects in many areas of the world have designed and built them for environmental activists. But now, rapidly rising energy costs are increasing the demand worldwide for green houses that use less energy and other resources.
(33)
听力原文：M: I'm so confused by my notes from Professor Lubna's lectures. It seems I have no talent on sociolinguistics at all.
W: Don't worry! How about reviewing them now over a cup of tea？
Q: What does the woman suggest？
(17)
微信支付 
支付宝支付