What does the passage mainly discuss? According to paragraph 2, which of the following has made the study of pheromones diffic

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问题 What does the passage mainly discuss?
According to paragraph 2, which of the following has made the study of pheromones difficult?

选项 A、Pheromones cannot be easily reproduced in chemical laboratories.
B、Existing technology cannot fully explore the properties of pheromones.
C、Pheromones are highly volatile.
D、Pheromone signals are constantly changing.

答案B

解析

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托福（TOEFL）

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What does the passage mainly discuss? According to paragraph 2, which of the following has made the study of pheromones diffic

托福（TOEFL）

ReadthenoticeonthefollowingpageaboutStudentClubsandSocieties.ThenoticehasfourmainparagraphsA-D.Choosethemos

ReadtheinformationonTheMedicineinthepassagebelow.Dothefollowingstatementsagreewiththeinformationinthepassage

ReadtheinformationonTheMedicineinthepassagebelow.Dothefollowingstatementsagreewiththeinformationinthepassage

Lookatthepassageaboutbeebehaviouronthepreviouspages.Completethesentencesbelowwithwordstakenfromthepassage.

ThepassageonthefollowingpageshassevensectionsA-G.Choosethecorrectheadingforeachsectionfromthelistofheadings

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债券与其代表的权利联系在一起，拥有债券就拥有了债券所代表的权利，但是转让债券并不意味着债券所代表的权利也被转移。(　　)