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 Desert formation  沙漠的形成  -解答(2)

想要強化自身托福閱讀的能力，首先 "單字量" ，單字是學習語言的基石，單字量不足只會拖延作答時間。

(6) 3

This is a Factual Information question asking for specific information that can be found in paragraph 6. The correct answer is choice 3, “removal of the original vegetation.” Sentence 4 of this paragraph says that “the raising of most crops necessitates the prior removal of the natural vegetation, ” an explicit statement of answer choice 3. Choice 1, lack of proper irrigation techniques, is incorrect because the paragraph mentions only “overirrigation” as a cause of desertification. No irrigation “techniques” are discussed. Choices 2 and 4, failure to plant suitable crops and use of animal waste, are not discussed.

(7) 4

This is a Vocabulary question. A phrase is being tested here, and all of the answer choices are phrase. The phrase is “devoid of.” It is highlighted in the passage. “Devoid of means” without,” so the correct is choice , “Lacking in.” If you lack something that means you are without that thing.

(8) 4

This is a Factual Information question asking for specific information that can found in paragraph 9. The correct answer is choice 4, “bring salts to the surface.” The paragraph says that the final human cause of desertification is salinization resulting from overirrigation. The paragraph goes on to say that the overirrigation causes the water table to rise. bringing salts to the surface. There is no mention of the process “interfering” with or “limiting” irrigation, or of the “amount of air” the soil is required to absorb, so choices 1,2 and 3 are all incorrect.

(9) 3

This is a Negative Factual Information question asking for specific information that can be found in the passage. Choice 3, “insufficient irrigation,” is the correct answer. Choice 1, “soil erosion,” is explicitly mentioned in paragraph 2 as one of the primary cause of desertification, so it is not the correct answer. Choice 2, “global warning,” is mentioned as a cause of desertification in paragraph 4, so it is incorrect. Choice 4, “raising of livestock,” is described in paragraph 7 as another cause of desertification, so it is incorrect. The passage includes excessive irrigation as a cause of desertification, but not its opposite, insufficient irrigation, so that is the correct answer.