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【简答题】

The vast expanse of the United States of America stretches from the heavily industrialized, metropolitan Atlantic seaboard across the rich flat farms of the central plains, over the Rocky Mountains to the fertile west coast, then halfway across the Pacific to the balmy (温和的) island-state of Hawaii. The American scene awes the viewer with both its variety and size. The continental United States (not counting outlying Alaska and Hawaii) measures, 4,500 kilometers from its Atlantic to Pacific coasts, 2,575 kilometers from Canada to Mexico. The entire nation (all 50 states) covers an area of 9 million square kilometers and has a population of 220 million people. The sparsely settled, far-northern state of Alaska is the largest of America’’s 50 states. It is more than two and a half times the size of Sichuan province. Texas, in the southern part of the country, is second in size. Texas is half the size of Alaska. A land of heavy forests (311 million hectares) and barren deserts, of high-peaked mountains and deep canyons, America also enjoys bountiful rivers and lakes. The broad Mississippi River system, famed in song and legend, meanders 6,400 kilometers from Canada to the Gulf of Mexico— the world’’s third longest river after the Nile and Amazon. A c in the north join the Mississippi to the five Great Lakes— the world’’s largest inland water transportation route and the biggest body of fresh water in the world. America’’s early settlers were attracted by the fertile land and varied climates it offered for farming. Today, with 121 million hectares under cultivation, American farmers plant spring wheat on the cold western plain; they raise corn and fine beef cattle in the central plains, and rice in the damp heat of Louisiana. Florida and California are famous for their citrus fruits and tropical avocados; the cool rainy northeastern states for apples, pears, berries and vegetables. America has long been known as a "melting pot," for it is a nation of immigrants from all over the world. Europe, the major source of immigrants, began sending colonists to America in the early 17th century. Tens of millions flooded to America’’s shores from Europe between 1880 and the First World War. The next largest group of Americans trace their ancestry to Africa, black people now constitute over 11 percent of the population. The melting pot has also absorbed nearly 600,000 Japanese, half a million Chinese and 340,000 Filipinos. Many live in Hawaii, more than two-thirds of whose people boast on Asian or Polynesian heritage. Thanks to the__________America offers for agriculture, different states have their different special farming products.

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参考答案:
举一反三

【单选题】温和型噬菌体()

A.
只有溶源周期 
B.
只有裂解周期
C.
既有溶源周期,又有裂解周期
D.
既无溶源周期,又无裂解周期

【单选题】气候变化影响了咖啡种植,咖啡危机已在酝酿。气温和降水变化会降低咖啡的产量和质量,增加病虫害压力。研究显示,气温平均升高2℃会增加疾病(咖啡叶锈病)和害虫(咖啡虎天牛)的风险。事实上,大部分具有可能性的解决方案,或是代价昂贵,或是有负面后果。因而,需要研究更加经济可行的解决方案。 以下哪项如果为真,最能支持上述论证?

A.
若自己现有的咖啡作物被摧毁,生产者可能被迫回到种植经济代价较小的作物
B.
即使温度变暖,农民依然可以在更高的山上种植咖啡,但可能会影响森林植被
C.
咖啡的经济效应是显著的,可以加大资金投入建造遮阳系统或广泛防治病虫害
D.
香蕉和咖啡豆间作,利用香蕉植株来提供种植咖啡豆所需要的额外资金和阴凉

【单选题】温和灸的叙述中错误的为

A.
约距离5~7cm处熏烤
B.
一般每穴灸10~15分钟
C.
一般以皮肤红晕为度
D.
医生可以将食指、中指置于施灸部位两侧感温以调节距离
E.
以局部感觉温热而无灼痛为宜
相关题目:
【单选题】温和型噬菌体()
A.
只有溶源周期 
B.
只有裂解周期
C.
既有溶源周期,又有裂解周期
D.
既无溶源周期,又无裂解周期
【单选题】气候变化影响了咖啡种植,咖啡危机已在酝酿。气温和降水变化会降低咖啡的产量和质量,增加病虫害压力。研究显示,气温平均升高2℃会增加疾病(咖啡叶锈病)和害虫(咖啡虎天牛)的风险。事实上,大部分具有可能性的解决方案,或是代价昂贵,或是有负面后果。因而,需要研究更加经济可行的解决方案。 以下哪项如果为真,最能支持上述论证?
A.
若自己现有的咖啡作物被摧毁,生产者可能被迫回到种植经济代价较小的作物
B.
即使温度变暖,农民依然可以在更高的山上种植咖啡,但可能会影响森林植被
C.
咖啡的经济效应是显著的,可以加大资金投入建造遮阳系统或广泛防治病虫害
D.
香蕉和咖啡豆间作,利用香蕉植株来提供种植咖啡豆所需要的额外资金和阴凉
【单选题】温和灸的叙述中错误的为
A.
约距离5~7cm处熏烤
B.
一般每穴灸10~15分钟
C.
一般以皮肤红晕为度
D.
医生可以将食指、中指置于施灸部位两侧感温以调节距离
E.
以局部感觉温热而无灼痛为宜
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