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【单选题】
下列不能用于人工主动免疫的生物制品是A.
活疫苗
B.
亚单位疫苗
C.
胎盘球蛋白
D.
类毒素
E.
死疫苗
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举一反三
【简答题】______(我正要打电话给他)when his letter arrived．
【单选题】It worried me that the letter had not arrived, especially ________ it had never happened before.
A.
when
B.
that
C.
as
D.
which
【单选题】My letter arrived shortly after he passed away. I regret _________ earlier.
A.
not to have written it
B.
not to have opened it
C.
not having opened it
D.
not having written it
【单选题】The letter they looked forward to______ at last.
A.
arrive
B.
arrived.
C.
arriving
D.
had arrived
【单选题】Your letter arrived a few days ago and I must confess that this obligation completely ()my mind.
A.
sliped
B.
skiped
C.
shipped
D.
slipped
【单选题】关于细胞凋亡与细胞坏死，下列说法正确的是 [ ]
A.
细胞凋亡是细胞内的遗传物质控制的
B.
细胞死亡是细胞凋亡的同义词
C.
细胞凋亡受到严格的由遗传机制决定的程序性调控
D.
细胞的自然更新属于凋亡，被病原体感染细胞的清除属于细胞坏死
【简答题】极限编程的原则(或实践)包括:增量式规划, 、 等。(写出其中的两个)
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