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【多选题】
下列现象中不属于离体培养容易出现的三大问题的是A.
污染
B.
C.
玻璃化
D.
褐变
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反馈参考答案：
举一反三
【简答题】机器和机构总称为 。
【简答题】听录音，选答句。 ( ) 1. A. No, I don't. ( ) 2. A. Sorry, I don't know. ( ) 3. A. It's on the chair. ( ) 4. A. They're fans. B. Yes, I am. B. I have five. B. She's in the computer. B. It's a li...
【单选题】—It’s our duty to homeless people in earthquake areas food and clothes. —I agree with you. We should do something for them.
A.
provide, of
B.
provide , with
C.
provide , for
【单选题】I don't know why you're so concerned—it isn't your problem______.
A.
first of all
B.
after all
C.
all in all
D.
in all
【单选题】It's my first time to come to China and I don't know ____ I can change the money.
A.
what
B.
that
C.
where
D.
why
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