[填空题]The continental United States will face more extreme temperatures during the next century and worse rainfall along its Gulf Coast which has been ravaged by hurricanes this year, according to a climate study. The study warned that{{U}} (36) {{/U}}gases will likely swell to twice their{{U}} (37) {{/U}} levels by the century’s end. "Imagine the weather during the hottest two weeks of the year," lead{{U}} (38) {{/U}}Noah Diffenbaugh said, referring to northeast United States. "The area could experience temperatures in that range{{U}} (39) {{/U}}for periods of up to two months by century’s end," he said. Researchers claimed the study, run on supercomputers, is the most comprehensive{{U}} (40) {{/U}} model to date. It{{U}} (41) {{/U}}the southwest United States could endure a 500 percent increase in hot events, leaving less water for the growing population, that the Gulf Coast region would {{U}} (42) {{/U}}more rainfall in a shorter time span and that summers in the nor

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[填空题]The United States spend much more money on programs to prevent diseases than on treatment for diseases.

[单项选择]If the United States had built more homes for poor people in 1955, the housing problems now in some parts of the country （） so serious.
A. wouldn’t be
B. wouldn’t have been
C. will not be
D. would have not been

[单项选择]

Every second in the United States alone, more than 250 animals are slaughtered for food, adding up to more than 8 billion animals each year. Reducing the amount of meat in one’s diet is nutritionally, environmentally, and ethically beneficial.
People who eat meat usually have weaker immune systems compared to those of vegetarians. Meat has been directly linked to diabetes, obesity, arthritis, and many other illnesses. Furthermore, meat-eaters are at a higher risk for diseases, including cancer, and they are more likely to die from these diseases. Critics say that a meatless diet does not provide enough nutrients, especially protein and iron. Actually, according to "A Teen’s Guide to Going Vegetarian", by Judy Krizmanic, protein is found in almost every food, and iron appears in many vegetables. Getting enough nutrients in a meat-reduced diet should not be difficult. A 1988 study found that some of the highest pesticide residues appear in meat and egg
A. Positive.
B. Negative.
C. Indifferent.
D. None of the above.