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【单选题】
与初次应答相比，再次应答抗体产生的特点是A.
由高浓度抗原诱发
B.
抗体产生前有较长的潜伏期
C.
主要为IgG类抗体，且产生迅速
D.
反应后期出现IgM型抗体
E.
维持时间短
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【单选题】Education ______ an importan t role in the future of a nation.
A.
plays
B.
play
C.
playing
D.
are playing
【简答题】How was Nina's life in Shanghai?
【单选题】The President was talking to all the department heads while a group of unexpected important clients had arrived for a talk with him.
A.
when ... were arriving
B.
as ... had arrived
C.
when ... arriving
D.
when ... arrived
【单选题】La Nina also impacts global weather and tends to have _______ effects to El Nino.
A.
similar
B.
same
C.
unkown
D.
opposite
【简答题】The lecturer says the advances of the 20th century are ______.than all the other periods combined.
【单选题】What can you infer from what Nina says about the best management style?
A.
It is composed of the best that both genders bring to the table.
B.
It should be a male-boss/ female-employee relationship.
C.
The best management style is the women are in the leading position.
D.
The best management style is impossible to realize before she dies.
【单选题】The passage implies that（ ）.
A.
the placement of a story is not quite important.
B.
the report of a crime may not be true.
C.
local newspapers are not interested in company—sponsored programs.
D.
publicity is not always necessary.
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