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）

UsingNOMORETHANTHREEWORDS,answerthefollowingquestions.Writeyouranswersinboxes18and19onyouranswersheet.Ho

ReadthenoticeonthefollowingpageaboutStudentClubsandSocieties.ThenoticehasfourmainparagraphsA-D.Choosethemos

Lookatthenoticebelow.UsingNOMORETHANTHREEWORDSAND/ORANUMBERanswerthefollowingquestions.Writeyouranswersinb

ReadtheinformationonTheMedicineinthepassagebelow.Dothefollowingstatementsagreewiththeinformationinthepassage

Lookatthepassageaboutbeebehaviouronthepreviouspages.Completethesentencesbelowwithwordstakenfromthepassage.

ReadthepassagebelowandanswerQuestions22-27.InformationonPhotocopyingInformationServicesprovideaPrepaidServicesC

不属于国家监督的是【】

企业改制应切实维护职工的合法权益，国有企业改制为非国有企业的职工安置方案()。

紊流光滑区的沿程损失hf，与平均流速v的多少次方成正比?()

某工作E有两项紧后工作F和G,已知E工作的自由时差为2天,F工作的总时差为0天,G工作的总时差为2天,则E工作的总时差为()。

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Fromwhatweread,weknowthat______.Whytheteacherdidn’tsendtheotherchildrentotheheadmaster?

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