What does the passage mainly discuss? The purpose of the second mention of "hormones" in line 4 is to point out

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问题 What does the passage mainly discuss?
The purpose of the second mention of "hormones" in line 4 is to point out

选项 A、chemical signals that are common among insects
B、specific responses of various species to chemical signals
C、similarities between two chemical substances
D、how insects produce different chemical substances

答案C

解析

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托福（TOEFL）

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What does the passage mainly discuss? The purpose of the second mention of "hormones" in line 4 is to point out

托福（TOEFL）

Whattypeofgardenplantscanbenefitbirdsandinsects?

Completetheflowchartbelow.ChooseNOMORETHANONEWORDfromthepassageforeachanswer.DuringtheassemblyoftheSurveyo

Accordingtothewriter,whatviewaboutvideogamesdoesSusanGreenfieldputforwardinhernewbook?

AtthestartofhertalkRebeccapointsoutthatnewgraduatescanfindithardto______.Whenshehaddevelopedaportfolioo

HowdidthetravellerhearaboutNewYork?Whateventsdidthetravellersee?

Whichmemberormembersofthespeaker’sfamilyhavehealthproblems?Howdoesthespeakerdescribethepeopleattheresort?

Whichmemberormembersofthespeaker’sfamilyhavehealthproblems?Howdidthespeaker’sfamilyfirstfindoutabouttheWai

A、She’sunabletoattendthestudysession.B、Shehasseenadoctorrecently.C、She’sconcernedaboutmedicalcare.D、Shementio

Thewaterof(the)Atlantic,Pacific,andIndianOceans(makeup)70.8percent(to)theEarth’s(surface).

LichensTobecertain,alichenisnotthemostconspicuousofplants.Lichensgrowinunassumingfashiononrocks,logsand

电梯轿厢缓冲器支座下的底坑地面应能承受的作用力是()。

患者，心悸，善惊易恐，坐卧不安，舌苔薄白，脉象虚弦，属下列何种证候

Ⅲ度烧伤()

有抗冰(盐)冻要求地区，各交通等级路面、桥面、路缘石、路肩及贫混凝土基层必须使用()。

旅游交通运输相对于一般交通运输而言，具有()的特点。

“山重水复疑无路，柳暗花明又一村”是()的脍炙人口的千古名句。

非理性经济人是指一般传统上人们认为只顾追求个人经济利益而从不考量他人及社会利益，从而最终导致恶意性竞争及利益失效的经济人。以下不属于非理性经济人要素的是()。

下列关于第三次科技革命的说法，不正确的是()。

马克思、恩格斯之所以能够创立科学社会主义学说，从而从根本上超越了空想社会主义、实现了社会主义从空想到科学的伟大飞跃。主要是因为他们()

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