[填空题]How does the inflation affect Wealth and Redistribution of Income

[单项选择]How does water scarcity affect people First of all, it (31) their health. It is not that they will die of thirst; rather, the poor quality of the water (32) for cooking and drinking may make them ill.
(33) our bodies require water to treat waste products, plentiful water is required for proper sanitation (卫生)—water that for much of mankind is simply not available. (34) people without adequate sanitation rose from 2.6 billion in 1990 to 2.9 billion in 1999. And sanitation is literally a matter of life and death. In a (35) statement, United Nations officials warned:
"When children lack water that is fit for drinking and sanitation, virtually every aspect of their health and development is (36) ."
Food production is dependent on water. Many crops, of course, are watered by rain, but in recent times irrigation has become the key (37) the world% booming population. Today percent of the world’s harvest depends on irrigation.A. hurts
B. harms
C. injures
D. destroys

[单项选择]How does food affect mood and mind The answer may lie in the chemistry of the brain and nervous system. Molecules called neurotransmitters (神经传递素) are chemical messengers. They carry a nerve impulse across the gap between nerve cells. The release of neurotransmitter molecules from one neuron and their attachment to receptor sites on another keep a nerve impulse moving.
Nerve impulses carry messages from the environment to the brain, for example, the pain you feel when you stub (踢碰) your toe. They also carry messages in the other direction, from the brain to the muscles. That’s why you back away from the obstacle that initiated the pain signal and exclaim, "Ouch!"
"Many neurotransmitters are built from the foods we eat," says neuroscientist Eric Chudler of the University of Washington. Too little or too much of a particular nutrient in the diet can affect their production, Chudler says. For example, tryptophan from foods such as yogurt, milk, bananas, and egg
A. a transport vehicle
B. a protective shield
C. a power plant
D. a food factory

[单项选择]How does the weather affect the growth of a tree
A. Plenty of sunlight and rainfall will limit the growth of a tree.
B. A tree grows best with little sunlight and rain.
C. Some trees provide an exact record of the weather.
D. The weather determined the pattern of rings in a tree trunk.

[单项选择]How does water scarcity (缺乏) affect people First of all, it (51) their health. It is not that they will die (52) thirst; rather, the poor quality of the water (53) for cooking and drinking may make them ill.
(54) our bodies require water to treat waste products, plentiful water is required for propersanitation (卫生) -water (55) for much of mankind is simply not available. (56) people without adequate sanitation rose from 2.6 billion in 1990 to 2.9 billion in 1999. And sanitation is literally a matter of life and death. In a (57) statement, United Nations officials warned:" When children lack water that is fit (58) drinking and sanitation, virtually every aspect of their health and development is (59) ."
Food production is (60) on water. Many crops, of course, are watered by rain, but in recent times irrigation has become the key: (61) the world’ s booming population. Today 36 perc
A. who
B. that
C. how
D. where