朗阁首页 > 雅思频道 > 雅思机经 > 2019年7月20日雅思阅读考题回顾

2019年7月20日雅思阅读考题回顾

来源:网络 2019-08-15 编辑:yawen 雅思托福0元试学

备考资料免费领取

本文主要是关于2019年7月20日的雅思阅读考题回顾,希望能对大家的考试有所帮助。


考试日期

2019720

 

Reading Passage 1

Title

北级科考船

Question types

Matching Information 

Sentence Completion 

TRUE/FALSE/NOT GIVEN

文章内容回顾

文章大意:北极现了一艘沉没的科考船,科考船载的是十几年前英国人去北极考的团队,当的设备技术等安全有,莫名失踪后,悬赏找,因纽特人帮救援。科学家讨论船当年遇难的原因。

Passage1: 北极科考船

参考答案:

1. True

2. Not Given

3. False

4. False

5. Not Given

6. False

7. True

8. geology

9. sonar

10. manufactured

11. water

12. engines

13. stories 

题型难度分析

适中。

题型技巧分析

段落信息匹配,考查的是在原文中寻找特定信息的能力

段落细节配对一般出现在文章的*部分

文章段落数和题目数常常不一致

该题型的出题范围是全文

乱序,段落细节配对靠后做,先做顺序原则的细节题

剑桥雅思推荐原文练习

11 Test 2 Passage 1

 

Reading Passage 2

Title

Honey Bees in Trouble

Question types

YES/NO/NOT GIVEN

Multiple Choice

Matching Headings 

文章内容回顾

A

Recently, ominous headlines have described a mysterious ailment, colony collapse disorder (CCD), which is wiping out the honeybees that pollinate many crops. Without honeybees, the story goes, fields will be sterile, economies will collapse, and food will be scarce.

B

But what few accounts acknowledge is that what’s at risk is not itself a natural state of affairs. For one thing, in the United States, where CCD was first reported and has had its greatest impacts, honeybees are not a native species. Pollination in modern agriculture isn’t alchemy, it’s industry. The total number of hives involved in the U.S. pollination industry has been somewhere between 2.5 million and 3 million in recent years. Meanwhile, American farmers began using large quantities of organophosphate insecticides, planted large-scale crop monocultures, and adopted “clean farming” practices that scrubbed native vegetation from field margins and roadsides. These practices killed many native bees outright — they’re as vulnerable to insecticides as any agricultural pest — and made the agricultural landscape inhospitable to those that remained. Concern about these practices and their effects on pollinators isn’t new, in her 1962 ecological alarm cry Silent Spring, Rachel Carson warned of a ‘Fruitless Fall’ that could result from the disappearance of insect pollinators.

C

If that ‘Fruitless Fall’ has not — yet — occurred, it may be largely thanks to the honeybee, which farmers turned to as the ability of wild pollinators to service crops declined. The honeybee has been semi-domesticated since the time of the ancient Egyptians, but it wasn’t just familiarity that determined this choice: the bees’ biology is in many ways suited to the kind of agricultural system that was emerging. For example, honeybee hives can be closed up and moved out of the way when pesticides are applied to a field. The bees are generalist pollinators, so they can be used to pollinate many different crops. And although they are not the most efficient pollinator of every crop, honeybees have strength in numbers, with 20,000 to 100,000 bees living in a single hive. “Without a doubt, if there was one bee you wanted for agriculture, it would be the honeybee,” says Jim Cane, of the U.S. Department of Agriculture. The honeybee, in other words, has become a crucial cog in the modern system of industrial agriculture. That system delivers more food, and more kinds of it, to more places, more cheaply than ever before. But that system is also vulnerable, because making a farm field into the photosynthetic equivalent of a factory floor, and pollination into a series of continent-long assembly lines, also leaches out some of the resilience characteristic of natural ecosystems.

D

Breno Freitas, an agronomist in Brazil, pointed out that in nature such a high degree of specialization usually is a very dangerous game: it works well while all the rest is in equilibrium, but runs quickly to extinction at the least disbalance. In effect, by developing an agricultural system that is heavily reliant on a single pollinator species, we humans have become riskily overspecialized. And when the human-honeybee relationship is disrupted, as it has been by colony collapse disorder, the vulnerability of that agricultural system begins to become clear. In fact, a few wild bees are already being successfully managed for crop pollination. “The problem is trying to provide native bees in adequate numbers on a reliable basis in a fairly short number of years in order to service the crop,” Jim Cane says. “You’re talking millions of flowers per acre in a two-to three-week time frame, or less, for a lot of crops.” On the other hand, native bees can be much more efficient pollinators of certain crops than honeybees, so you don’t need as many to do the job. For example, about 750blue orchard bees (Osmia lignaria) can pollinate a hectare of apples or almonds, a task that would require roughly 50,000 to 150,000 honeybees. There are bee tinkerers engaged in similar work in many corners of the world. In Brazil, Breno Freitas has found that Centris tarsata, the native pollinator of wild cashew, can survive in commercial cashew orchards if growers provide a source of floral oils, such as by interplanting their cashew trees with Caribbean cherry.

E

In certain places, native bees may already be doing more than they’re getting credit for. Ecologist Rachael Winfree recently led a team that looked at pollination of four summer crops (tomato, watermelon, peppers, and muskmelon) at 29 farms in the region of New Jersey and Pennsylvania.

Winfree’s team identified 54 species of wild bees that visited these crops, and found that wild bees were the most important pollinators in the system: even though managed honeybees were present on many of the farms, wild bees were responsible for 62 percent of flower visits in the study. In another study focusing specifically on watermelon, Winfree and her colleagues calculated that native bees alone could provide sufficient pollination at 90percent of the 23 farms studied. By contrast, honeybees alone could provide sufficient pollination at only 78 percent of farms.

F

“The region I work in is not typical of the way most food is produced,” Winfree admits. In the Delaware Valley, most farms and farm fields are relatively small, each farmer typically grows a variety of crops, and farms are interspersed with suburbs and other types of land use which means there are opportunities for homeowners to get involved in bee conservation, too. The landscape is a bee-friendly patchwork that provides a variety of nesting habitat and floral resources distributed among different kinds of crops, weedy field margins, fallow fields, suburban neighborhoods, and seminatural habitat like old woodlots, all at a relatively small scale. In other words, “pollinator friendly” farming practices would not only aid pollination of  雅思阅读 考题

分享到:

雅思托福 全套备考资料
扫一扫!进群获取独家干货!

热门雅思培训课程推荐

  • 适用人群
  • 词汇量1000
  • 词汇量1500
  • 词汇量2000以上
  • 词汇量6000以上
  • 开课时间
  • 热报中
  • 滚动开班
  • 即将开班
  • 热报中
沪ICP备 17003234 号 图书经营许可证:第A7651号 版权所有:上海朗阁教育科技股份有限公司 Copyright 2005 LONGRE EDUCATION GROUP All Rights Reserved