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【单选题】
下列有关性别决定的叙述，正确的是 [ ]A.
XY型性别决定的生物，Y染色体都比X染色体短小
B.
同型性染色体决定雌性个体的现象在自然界中比较普遍
C.
含X染色体的配子都是雌配子，含Y染色体的配子都是雄配子
D.
各种生物细胞中的染色体都可分为性染色体和常染色体
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举一反三
【单选题】An employee who has finished the task efficiently and effectively will be given ______ over one who has not.
A.
priority
B.
privilege
C.
publicity
D.
privacy
【单选题】With a school built in the village, the children needn't climb the mountain for study.
A.
at
B.
for
C.
over
D.
in
【单选题】Doctors in Britain are warning of all obesity time bomb, when children who are already overweight grow up. So, what should we do? Exercise more? Eat less? Or both? The government feels it has to take ...
A.
how to keep fit and avoid fatness
B.
increased risks for overweight people
C.
the dangers of exercise in the gym
D.
the benefit of a balanced diet
【简答题】急性白血病的共同临床表现为()、()、()、()。
【简答题】急性白血病主要临床表现是
【简答题】离心分离是基于固体颗粒和周围液体的()存在差异。
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