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【单选题】
关于再次产生免疫应答，描述错误的是A.
产生的抗体维持时间长
B.
主要抗体类型IgG
C.
抗体产生速度比初次应答慢
D.
抗体亲和力强
E.
抗体产生的诱导期较初次应答短
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举一反三
【单选题】听力原文：M: Can I make an appointment to have a talk with Professor Clinton? W: Sorry, Professor Clinton went to attend a meeting in the USA, and on his way back he'll be staying in Beijing for a week. We...
A.
In the USA.
B.
In Beijing.
C.
In Shanghai.
D.
On the plane.
【单选题】________ it rained very hard ,_______ they all went on working in the fields. [ ]
A.
Though；but
B.
Though；yet
C.
But; though
D.
Although; but
【简答题】–Sorry, Professor Smith. I didn’t finish the assignment yesterday. --Oh, you _____ have done it as yesterday was the deadline. A. must B, mustn’t C, should D. shouldn’t
【单选题】---Sorry, Professor Smith. I didn't finish the assignment yesterday. ---Oh, you_______ have done it as yesterday was the deadline.
A.
must
B.
mustn't
C.
should
D.
shouldn't
【单选题】--What did the professor ask us to do just now? --Sorry, I ______ about my trip to the Wolf Hill at the weekend.
A.
had thought
B.
was thinking
C.
thought
D.
think
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