[填空题]Leaves show different colors other than green in the fall because the carotenoids and anthocyanins are then______.

[填空题]Leaves show different colors other than green in the fall because the carotenoids and anthocyanins are then______.

[填空题]better than any other

[填空题]总的来说 women prefer brighter colors than men do.

[填空题]While writing exams for courses other than English, you may tend to ______.

[单项选择]Technically, any substance other than food that alters our bodily or mental functioning is a drug. Many people mistakenly believe the term drug refers only to some sort of medicine or an illegal chemical taken by drug addicts. They don’’t realize that familiar substances such as alcohol and tobacco are also drugs. This is why the more neutral term substance is now used by many physicians and psychologists. The phrase" substance abuse" is often used instead of" drug abuse" to make clear that substances such as alcohol and tobacco can be just as harmfully misused as heroin and cocaine. 　　We live in a society in which the medicinal and social use of substances (drugs) is pervasive: an aspirin to quiet a headache, some wine to be sociable, coffee to get going in the morning, a cigarette for the nerves. When do these socially acceptable and apparently constructive uses of a substance become misuses First of all ,most substances taken in excess will produce negative effects such as poisonin
A. substances can alter our bodily or mental functioning if illegally used
B. "drug abuse" is only related to a limited number of drug takers
C. alcohol and tobacco are as fatal as heroin and cocaine
D. many substances other than heroin or cocaine can also be poisonous

[单项选择]

Forces other than damaging winds are also at work inside tornadoes. Sometimes, as the twisting funnel passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion is caused by the low air pressure at the center of a tornado.
The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, a bout 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pres sure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57 600 pounds. The pressure on the four walls adds up to 172 800 pounds.
If windows are open in the building, some of the inside air will rus
A. Why Tornadoes Cause So Much Damage
B. Where Tornadoes Arc Formed
C. How Tornadoes Can Be Prevented
D. When Tornadoes Usually Occur