托福聽力考試模擬訓(xùn)練

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2017年托福聽力考試模擬訓(xùn)練

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2017年托福聽力考試模擬訓(xùn)練

　　Butterflies are among the most extensively studied insects — it is estimated that 90 percent of the world's species have scientific names. As a consequence, they are perhaps the best group of insects for examining patterns of terrestrial biotic diversity and distribution. Butterflies also have a favorable image with the general public. Hence, they are an excellent group for communicating information on science and conservation issues such as diversity.

　　Perhaps the aspect of butterfly diversity that has received the most attention over the past century is the striking difference in species richness between tropical and temperate regions. For example, in 1875 one biologist pointed out the diversity of butterflies in the Amazon when he mentioned that about 700 species were found within an hour's walk, whereas the total number found on the British islands did not exceed 66, and the whole of Europe supported only 321. This early comparison of tropical and temperate butterfly richness has been well confirmed.

　　A general theory of diversity would have to predict not only this difference between temperate and tropical zones, but also patterns within each region, and how these patterns vary among different animal and plant groups. However, for butterflies, variation of species richness within temperate or tropical regions, rather man between them, is poorly understood. Indeed, comparisons of numbers of species among the Amazon basin, tropical Asia, and Africa are still mostly "personal communication" citations, even for vertebrates. In other words, unlike comparison between temperate and tropical areas, these patterns are still in the documentation phase.

　　In documenting geographical variation in butterfly diversity, some arbitrary, practical decisions are made. Diversity, number of species, and species richness are used synonymously; little is known about the evenness of butterfly distribution. The New World butterflies make up the preponderance of examples because they are the most familiar species. It is hoped that by focusing on them, the errors generated by imperfect and incomplete taxonomy will be minimized.

　　1. Which aspect of butterflies does the passage mainly discuss?

　　(A) Their physical characteristics

　　(B) Their names

　　(D) Their variety

　　2. The word "consequence" in line 2 is closest in meaning to

　　(A) result

　　(B) explanation

　　(D) requirement

　　3. Butterflies are a good example for communicating information about conservation issues because they

　　(A) are simple in structure

　　(B) are viewed positively by people

　　(D) are found mainly in temperate climates

　　4. The word "striking引人注目的" in line 8 is closest in meaning to

　　(A) physical

　　(B) confusing

　　(D) successful

　　5. The word "exceed超過" in line 11 is closest in meaning to

　　(A) locate

　　(B) allow

　　(D) come close to

　　6. All of the following are mentioned as being important parts of a general theory of diversity EXCEPT

　　(A) differences between temperate and tropical zones

　　(B) patterns of distribution of species in each region

　　(D) variation of patterns of distribution of species among different animals and plants

　　7. The author mentions tropical Asia in lines 19 as an example of a location where

　　(A) butterfly behavior varies with climate

　　(B) a general theory of butterfly diversity has not yet been firmly established

　　(D) documenting plant species is more difficult than documenting butterfly species

　　8. Which of the following is NOT well understood by biologists?

　　(A) European butterfly habitats

　　(B) Differences in species richness between temperate and tropical regions

　　(D) Comparisons of behavior patterns of butterflies and certain animal groups

　　9. The word "generated引起，導(dǎo)致" in line 26 is closest in meaning to

　　(A) requested

　　(B) caused

　　(D) estimated

　　答案：DABCC CBCB

　　語法小試牛刀

　　43. In the United States, (the) attorney general is a cabinet內(nèi)閣 (member) in charge (with) the (administration) of the Department of Justice.

　　答案: C withàof

　　44. (Toward) the end of his life, John Singer Sargent (returned) to the painting of landscapes and (the use) of watercolors, (of) which he excelled.擅長

　　答案: D ofàat

　　(4) of +抽象名詞 eg: an object of value = a valuable object, it is of great value=it is very valuable 其它如： of interest/ value/ importance/ necessity/ help/ no use, etc.

　　7. 固定詞組及搭配 adv + prep = prep

　　aside from, because of, on account of, according to ,regardless of, in spite of, in honor of , contrary to, on the contrary, by means of, due to, owing to, thanks to, on the basis of, in danger of, in view of, instead of, in addition to, for the sake of , for the most part, in response to

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