[单项选择]

Every day of our lives we are in danger of instant death from small high-speed missiles from space—the lumps of rocky or metallic debris which continuously bombard the Earth. The chances of anyone actually being hit, however, are very low, although there are recorded instances of "stones from the sky" hurting people, and numerous accounts of damage to buildings and other objects. At night this extraterrestrial material can be seen as "fireballs" or "shooting stars", burning their way through our atmosphere. Most, on reaching our atmosphere, become completely vaporised.
The height above ground at which these objects become sufficiently heated to be visible is estimated to be about 60-100 miles. Meteorites that have fallen on buildings have sometimes ended their long lonely space voyage incongruously under beds, inside flower pots or even, in the case of one that landed on a hotel in North Wales, within a chamber pot. Before the era of sp
A. big bright stars from space
B. man-made space vehicles
C. great interstellar dust clouds
D. small high-speed pieces of rock from space

[单项选择]

Every day of our lives we are in danger of instant death from small high-speed missiles from space—the lumps of rocky or metallic debris which continuously bombard the Earth. The chances of anyone actually being hit, however, are very low, although there are recorded instances of "stones from the sky" hurting people, and numerous accounts of damage to buildings and other objects. At night this extraterrestrial material can be seen as "fireballs" or "shooting stars", burning their way through our atmosphere. Most, on reaching our atmosphere, become completely vaporised.
The height above ground at which these objects become sufficiently heated to be visible is estimated to be about 60-100 miles. Meteorites that have fallen on buildings have sometimes ended their long lonely space voyage incongruously under beds, inside flower pots or even, in the case of one that landed on a hotel in North Wales, within a chamber pot. Before the era of sp
A. turned from stones into missiles
B. turned from a fireball into black
C. turned from a solid into a gas
D. turned from meteors into shooting stars

[填空题]We use language every day and we live in a world of words. Hardly any
moment passes with someone talking, writing or reading. Indeed, 41. ______
languages is most essential to mankind. Our lives increasingly depend
on fast and successful use of language. Strangely enough, we know 42. ______
more about things around us than on ourselves. For example, language 43. ______
is species specific, that is, it is language that differs human from 44. ______
animals. However, we do not know yet how exactly we inquire language 45. ______
and how it is possible for us to perceive through language; nor we 46. ______
understand precise the relationships between language and thought, 47. ______
language and logic, or language and culture; still less, how and when
language started. One reason for this inadequate knowledge of language
is that we, like language users, take too many things

[多项选择]Every day we read a lot of books, from our textbooks to some magazines or romantic stories. Have you ever thought about the speed or the rate of reading
Some people read very rapidly; others read very slowly. A rapid reader may say, "I read a long story in one evening." However someone who reads slowly perhaps say, "I read slowly, but carefully. And I am familiar with every detail (细节)." So who do you think is the better reader The slow reader or the rapid reader
In my opinion, the key question is not the speed. That is to say, we cannot draw a conclusion that the rapid reader is the good reader, or the slow reader is good. It depends on what we are reading and what’s our purpose of reading. If you are a rapid reader, you may be a good reader when you read a story book for fun, and it will not take you too much time. But when you have to read a textbook or a research report, you’d better slow your speed and read it word by word to avoid making any possible mistake. On the oth
A. The slow reader. B. The rapid reader. C. It is not mentioned. D. It all depends.

[单项选择]

Worldwide every day, we devour the energy equivalent of about 200 million barrels of oil. Most of the energy on earth comes from the sun. In fact enough energy from the sun hits the planet’s surface each minute to cover our needs for an entire year, we just need to find an efficient way to use it. So far the energy in oil has been cheaper and easier to get at. But as supplies dwindle, this will change, and we will need to cure our addiction to oil.
Burning wood satisfied most energy needs until the steam-driven industrial revolution, when energy-dense coal became the fuel of choice. Coal is still used, mostly in power stations, to cover one quarter of our energy needs, but its use has been declining since we started pumping up oil. Coal is the least efficient, unhealthiest and most environmentally damaging fossil fuel, but could make a comeback, as supplies are still plentiful; its reserves are five times larger than oil’s.
Today petroleum, a mineral o
A. The United States.
B. Russia.
C. Norway.
D. Venezuela.