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【单选题】
____ abroad for two years, the two astronauts went back home last year.A.
Educating
B.
Educated
C.
Having been educated
D.
being educated
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举一反三
【单选题】What did the police officer think of Ms Blunsden's room for animals?
A.
It was clean enough for animals to live in.
B.
It was just right for only one animal.
C.
It was not right for even a single animal.
【单选题】关于Hb和O2结合的叙述,错误的是
A.
1分子Hb可以结合4分子O2
B.
Hb的4个亚单位间有协同效应
C.
100ml血液中Hb所能结合的最大O2量称为Hb氧含量
D.
HbO2呈鲜红色，去氧Hb呈紫蓝色
E.
Hb与O2的结合或解离曲线呈S形
【简答题】直接筹资是企业直接从社会取得资金的一种筹资方式，一般只能用来筹集股权资金。()
【单选题】What did the customs officer do to the mango?
A.
He threw it away.
B.
He accepted it.
C.
He ate it.
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