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【单选题】
下列有关人类遗传病的叙述中，错误的是（）A.
抗维生素D佝偻病是由显性基因控制的遗传病
B.
冠心病可能是受两对以上的等位基因控制的遗传病
C.
猫叫综合征是人的第5号染色体部分缺失引起的遗传病
D.
21三体综合征患者的21号染色体比正常人多出一对
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A.
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B.
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C.
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D.
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【单选题】When the density of water is 1000,i.e.in fresh water and in summer zone a ship may load to the upper edge of the line marked（）.
A.
S
B.
T
C.
W
D.
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