With what topic is the passage mainly concerned? The hydra is a kind of______.

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问题 With what topic is the passage mainly concerned?
The hydra is a kind of______.

选项 A、flatworm
B、coelenterate
C、sea anemone
D、nerve cell

答案B

解析学生肯定不知道hydra和coelenterate这两个词意思。没关系，看看上下文就知道了：Nerve cells evidently first appeared in coelenterates——“hollow-gutted” organisms like hydra and the sea anemone．这里通过organisms就把这两个词连起来：coelenterates就是“hollow—gutted” organisms，而通过like这个词来举例，hydra是"hollow-gutted organisms”即coelenterates的一种。

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大学英语六级

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With what topic is the passage mainly concerned? The hydra is a kind of______.

大学英语六级

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Asthepaceoflifecontinuestoincrease,wearefastlosingtheartofrelaxation.Onceyouareinthehabitofrushingthroug

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Researcherssaypeopletravelingintrafficarethreetimesmorelikelytosufferaheartattack.Theysaytheriskofahearta

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