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【单选题】
在鉴别药材时,断面可见“星点”的药材是A.
何首乌
B.
白芍
C.
甘草
D.
大黄
E.
牛膝
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反馈参考答案：
举一反三
【单选题】Pollution didn't have much effect on the ecosystem.
A.
Right.
B.
Wrong.
C.
Doesn't say.
【简答题】生态系统(ecosystem)
【简答题】If we throw away too much waste and can’t keep good ecosystem,we _________ our future. A．must have destroyed B．could be destroying C．may be destroying D．must destroy
【单选题】All of the following words are defined in the passage EXCEPT
A.
ecosystem.
B.
soil quality.
C.
texture.
D.
manual texturing.
【单选题】In mini-ecosystem, the interrelations are categorized into two groups, among is that: a species inhibits or kills another, this phenomenon is called : .
A.
antagonism
B.
symbiosis
C.
interdependence
D.
competition
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