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【单选题】
在某些条件下，X染色体的某些部位趋向于断裂。具有这种症状的综合症是：A.
- 威利综合征
B.
脆性 X 染色体病
C.
特纳综合症
D.
猫叫综合征
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【单选题】Are You Getting Enough Sleep? What happens if you don't get enough sleep? Randy Gardner,a high school student in the UnitedStates,wanted to find out. He designed an experiment on the effects of sleepl...
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】Enough sleep is important to health. The amount of sleep 21 depends on the age of the person and the conditions in which sleep 22 The young may need more sleep than the old, but generally eight hours ...
【单选题】It is important for students to get _________. [ ]
A.
enough sleepy
B.
enough sleep
C.
sleep enough
D.
sleepy enough
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