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荒漠化是当前全球最严重的环境问题之一。由于全球在气候、地形、土地使用制度和社会经济制度等方面千差万别，因此要结合各国各地区的区域特点和实际确定荒漠化的范畴。我国幅员辽阔，自然条件和各地经济活动复杂，流水、风力、化学和物理四种营力过程所造成的土地退化均属于荒漠化。 下图为我国荒漠化土地成因比例图（其中①为物理及化学作用；②为工矿、交通等基本建设，如次生盐渍化）。读图，回答6～7题。 6.有关我国荒漠化的叙述，不正确的是（） A.我国荒漠化的成因主要是风蚀和水蚀 B.江南丘陵地区的荒漠化主要是风蚀产生的 C.山西省土地荒漠化发展与工矿、交通等基本建设相关 D.松嫩平原西部的荒漠化主要是风蚀 7.云贵高原和黄土高原荒漠化的共同原因是 …（） ①石灰岩广布、土层发育浅薄②植被破坏③土层疏松、直立性强④降水强度大，多暴雨⑤地表水缺乏 A.①②③ B.②④⑤ C.①③⑤ D.②③④
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举一反三
【单选题】The speaker thinks the driving test is a terrible experience ______
A.
because the government officers are hard to please
B.
because the learner has to go through several tough tests
C.
because the learner usually fails several times before he passes it
D.
because the driving test usually lasts two months
【单选题】Which of the following is the suggestion of the interviewer to the problem?
A.
The government should spend more money helping innovation.
B.
The kids should cultivate their love of science and invention.
C.
More inventor's clubs should be set up.
D.
Invention courses are necessary to children.
【单选题】It is often difficult for a man to be quite sure what tax he ought to pay to the government because it depends on so many different things: whether the man is married how many children he has whether ...
A.
how much education one has received
B.
whether one is single or married
C.
how old one's children are
D.
where one lives
【简答题】下列哪一项不是进入一个垄断行业的壁垒( )。 A) 垄断利润 B) 政府特许经营权 C) 专利权 D) 资源控制
【单选题】Which of the following proverbs can best summarize the authors suggestion to the government in Paragraph 4?
A.
Lock the stable door after the horse has been stolen.
B.
Repair the house before it rains.
C.
Do not put all your eggs in one basket.
D.
Sharpen your axe before cutting wood.
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