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【单选题】
DNA和RNA共有的碱基成分是A.
鸟嘌呤
B.
尿嘧啶
C.
D-核糖
D.
胸腺嘧啶
E.
D-2-脱氧核糖
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反馈参考答案：
举一反三
【单选题】When you come out of the lift, turn left. Dr. Smith's office is the second one on the right.
A.
Thank you.
B.
You are welcome.
C.
Don't mention it.
D.
Sorry to hear that.
【简答题】Whenyou come out of the lift, turn left. Mr. Smith's office is the second one onthe right.A. Thank you B. You are welcome C. Don't mention it D. Sorry to hear that
【简答题】If you arrive by train, what do you need to do when you come out of the station?
【单选题】when you come out of the lift, Mr. Smith's office is the second one on the right.
A.
you are welcome
B.
thank you
C.
sorry to hear that
D.
don't mention it
【单选题】When you come out of the lift, turn left. Me.Smith office is the second one on the right.
A.
Thank you.
B.
You’re welcome.
C.
Don’t mention it.
D.
Sorry to hear that’ll
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