it’s one thing to improve a person’s ability to see words and quite another thing to improve his ability to read a text efficiently. Reading requires the ability to understand the relationship between words. Consequently, for these reasons, many experts have now begun to question the usefulness of eye training, especially since any approach which trains a person to read isolated words and phrases would seem unlikely to help him in reading a continuous text
If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the the middle of the 21st century,if present trends continue, we will have used up all the oil that drives our cars,for if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however,has recently been suggested by American scientist, Professor Carl Sagan.
Sagan believes that before the earth's resources are compleetely exhausted it will be possible to change the
atmophere of Venus and so create a new world almost as large as earth itself. The difficult is that Venus is much hotter than the earth and there is only a tiny amount of water there. Sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on soon as this has been done, the algae will be placed in small rockets. Spaceship will then fly to Venus and fire the rockets into the atmosphere .In a fairly short time, the alge will break down the carbon dioxide into oxygen and carbon.
When the algae have done theri work, the atmosphere will become cooler,but befor man can set foot on Venus it will be neccessary for the oxygen to produce rain. The surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.
long run, the most insoluble problem caused by population growth on earth will probably be the lack of ______.
Sagan believes that Venus might be colonized from earth because _____
might be possible to change its atmosphere atmosphere is the same as the earth's is a good supply of water on Venus days on Venus are long enough Venus there is a lot of ________.
dioxide monoxide
are plants that can____. in very hot temperatures in very cold temperatures oxygen
of the above
5. Man can land on Venus only when_______. algae have done their work atmosphere becomes cooler oxygen rains there
答案：cabdd
Heroin addictions today is found chiefly among young men of minority groups in ghetto(犹太人区) the more than 60,000 known addicts,more than half live in New York of them live in New York figures show that more than half of the addicts are under 30 years of age.
Narcotic addiction in the United States is not limted to heroin middle-aged and older people who take narcotic drugs regularly to relieve pain can also become do some people who can get drugs easily,such as doctors,nurses,and show that this type of addict has personality and emotional problems very similar to those of other regular narcotic users.
Many addicts admit that getting a continued supply is the main object of their addict’s concentration on getting drugs often prevents continuing an education or working at a health is often may be sick one day from the effects of withdrawal and sick the next day from an show that an addict’s life span may be shortened by 15 to 20 addict is usually in trouble with the family and almost always in trouble with the law.
Some studies suggest that many of the known narcotic addicts had some trouble with the law before they became addicted,they may become even more involved with crime because it costs so much to support the heroin habit.
Most authorities agree that the addict’s involvement with crime is not a direct effect of the drug to crime is usually the only way to get that much addicts’ crimes are nearly always thefts or other crimes against
property.
Federal penalties for illegal narcotics usage were established under the Harris on Act of Act provides that illegal possession of narcotics is punishable by fines and/or can range from 2 to 10 years for the first offense,5 to 20 years for the second,and 10 to 20 years for further offenses.
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