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【简答题】
导致种子衰老的原因有细胞膜损伤、（）、（）、有毒物质积累、其他代谢产物、微生物分泌毒素。
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反馈参考答案：
举一反三
【单选题】听力原文： At the end of our program, we invite our listeners to write a comment or call and leave a message regarding their reactions to some of the ideas or opinions mentioned on our program. Since the o...
A.
One of the viewers.
B.
The producer of the show.
C.
The host of the show.
D.
A reporter.
【单选题】听力原文： Our family is trying to decide where to go for our vacation this summer. Our son Tom wants to go to Yellow Stone Park again to see the bears. We did that last summer, and what an experience it w...
A.
They haven't reached a decision yet.
B.
They have decided to go hunting bears.
C.
They want to go camping.
D.
They want to go exploring in the country.
【单选题】听力原文： Our family is trying to decide where to go for our vacation this summer. Our son Tom wants to go to Yellowstone Park again to see the hears. We did that last summer, and what an experience it wa...
A.
They haven't reached a decision yet.
B.
They have decided to go hunting bears.
C.
They want to go camping.
D.
They want to go exploring the country.
【简答题】构成胃底腺的细胞有()()()()()。
【单选题】听力原文： One of the reasons for our success as a species is our ability to eat and thrive on a large variety of foods. Many animal species have become extinct or are on the edge of extinction partly beca...
A.
It is all ability both man and animals possess.
B.
It is the reason for man's superiority over animals.
C.
It is one of the reasons for man's success as a species.
D.
It is a proof of our superior intelligence.
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