【单选题】【消耗次数：1】
最早提出克隆选择学说的科学家是
①
Burnet
②
Border
③
Porter
④
Jenner
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【单选题】
澳大利亚免疫学家Burnet对免疫学的重大贡献是
①
首次用无毒牛痘预防天花
②
首次提出克隆选择学说
③
首次建立单克隆抗体技术
④
首次提出免疫调节学说
⑤
首次发现免疫耐受
随机题目
【单选题】
30.We heard the news on _____ radio. They watched the news on _____ television.
①
the ;/
②
a;/
③
/ ;the
④
one;/
【单选题】
6.The university has introduced a new _______ of conduct on university life.
①
discipline
②
. code
③
key
④
. principle
【单选题】
7.We could see he felt ______ as he pointed and laughed at them.
①
inferior
②
. stupid
③
superior
④
advanced
【单选题】
27. I know the meeting will be on ______ Sunday in June, but I don’t know the exact date yet.
①
the
②
a
③
/
④
each
【单选题】
22. ______ Renaissance was the period of the revival of classical art and literature in the 14th to 16th centuries.
①
The
②
a
③
/
④
. one
【单选题】
10.A discount will be offered to _____ customers to the store.
①
usual
②
ordinary
③
regular
④
old
【单选题】
17. Realizing the immense international pressure, the President_____ stepped down.
①
conspicuously
②
gracefully
③
lonely
④
. truly
【单选题】
2. Whenever I called in on Paul, he _______ on the phone.
①
talked
②
is talking
③
was talking
④
will talk
【单选题】
3. He ______ hard until I told him to sit down and have a break.
①
was working
②
had been working
③
worked
④
has worked