GRE

简答题 As leeches clamp onto a host，they rather cleverly __________an anesthetic，
which prevents the host from noticing its parasitic visitors．

参考答案：暂无进入在线模考
A．If the leeches ingested(choice D)or collected(choice B)the anesthetic， it would affect them，not their host．They release the anesthetic(choice A)， dulling the host’ssenses．

你可能感兴趣的试题

1The common praying mantis is protected by a variety of self-delense mechanisms． These range from camouflage to an effective threat display．The mantis usesprotective coloration to blend in with the grasses and foliage through which Lineit moves．Some mantises use mimicry to imitate the look of a leafy twig or a(5)dead leaf．If a predator keeps coming，the mantis will exhibit several protective behaviors．It may puff itself up and spread its wings to 100k more threatening．It may reveal startling, colorful dots and patterns on its wings or legs．Some mantisesexpel air through their abdomens，making a hissing sound．If all else fails，the mantis will strike a predator with its forelegs or bite it with its strong mandibles．

根据以上内容，回答题。
The passage focuses primarily on

点击查看答案进入在线模考
2 Which fact about the praying mantis might be a suitable addition to the paragraph?

点击查看答案进入在线模考
3 Which of the following best describes the function of the first sentence of the passage?

点击查看答案进入在线模考

最新试题

For this question，write your answer in thebox． What percent

类型：简答题2012-10-18

For this question，write your answer in thebox． How much of

类型：简答题2012-10-18

For this question，indicate all of the answerchoices that ap

类型：简答题2012-10-18

For this question，indicate all of the answerchoices that ap

类型：简答题2012-10-18

Triangle PQR is isosceles and ∠PQR measures50°．Which of the

类型：简答题2012-10-18

What is the area of an equilateral trianglewith a side of l

类型：简答题2012-10-18

What is CD?

类型：简答题2012-10-18

If arc ABC measures 8π，what is the area of the circle?

类型：简答题2012-10-18

If a car at the dealership has less than 100，000 miles on i

类型：简答题2012-10-18

Which of the following data sets has thelargest standard de

类型：简答题2012-10-18