课程咨询

GRE首页 GRE课程 GRE动态 0元讲座 GRE模考网站

新东方在线 > GRE > GRE阅读 > 正文
扫码关注掌握一手留学资讯

扫码关注掌握一手留学资讯

回复XDF免费领

水平测试和备考资料

扫码关注公众号

GRE阅读:浮游生物

2017-01-21 15:20:00来源：!新东方在线

　　GRE阅读:浮游生物

　　Zooplankton, tiny animals adapted to an existence in the ocean, have evolved clever mechanisms for obtaining their food, miniscule phytoplankton (plant plankton). A very specialized feeding adaptation in zooplankton is that of the tadpolelike appendicularian who lives in a walnut-sized (or smaller) balloon of mucus equipped with filters that capture and concentrate phytoplankton. The balloon, a transparent structure that varies in design according to the type of appendicularian in habiting it, also protects the animal and helps to keep it afloat. Water containing phytoplankton is pumped by the appendicularian’s muscular tail into the balloon’s incurrent filters, passes through the feeding filter where the appendicularian sucks the food into its mouth, and then goes through an exit passage. Found in all the oceans of the world, including the Arctic Ocean, appendicularians tend to remain near the water’s surface where the density of phytoplankton is greatest.

　　17. It can be inferred from the passage that which of the following is true of appendicularians?

　　(A) They are exclusively carnivorous.

　　(B) They have more than one method of obtaining food.

　　(C) They can tolerate frigid water.

　　(D) They can disguise themselves by secreting mucus.(C)

　　(E) They are more sensitive to light than are other zooplankton.

　　18. The author is primarily concerned with

　　(A) explaining how appendicularians obtain food

　　(B) examining the flotation methods of appendicularians

　　(C) mapping the distribution of appendicularians around the world

　　(D) describing how appendicularians differ from other zooplankton(A)

　　(E) comparing the various types of balloons formed by appendicularians

　　19. According to the passage, all of the following are descriptive of appendicularians EXCEPT:

　　(A) tailed

　　(B) vegetarian

　　(C) small-sized

　　(D) single-celled(D)

　　(E) ocean-dwelling

　　20. The passage suggests that appendicularians tend to remain in surface waters because they

　　(A) prefer the warmer water near the surface

　　(B) are unable to secrete mucus at the lower levels of the ocean

　　(C) use the contrast of light and shadow at the surface to hide from predators

　　(D) live in balloons that cannot withstand he water pressure deeper in the ocean(E)

　　(E) eat food that grows more profusely near the surface

本文关键字: GRE阅读 GRE阅读真题

添加新东方美研助教回复【GRE】获取

模考真题|写作题库|阅读机经|佛脚词汇

更多资料

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多内容

关注新东方美研助教

回复【GRE】获取备考必看资料包

新东方美研备考资料
GRE录播课（全科班/单项班） GMAT6-8人直播VIP小班 托福直播精讲班（30天/60天）
更多>>
更多惊喜>>

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多资料
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10