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【多选题】
在选择作物群体改良的基础群体时，必须注意的的因素包括有哪些？A.
自身遗传基础优良且来源广泛
B.
群体目标性状平均值的高低
C.
群体目标性状遗传变异 的大小
D.
群体目标性状加性遗传方差 的 大小
E.
群体目标性状杂种优势的强弱问题
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【单选题】I don ’ t think you are allowed to speak loudly at the cinema,_________?
A.
are you
B.
aren ’ t you
C.
do you
D.
don ’ t you
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