遗传学上把F1(子一代)与隐性亲本个体之间的交配称为()。
A、杂交
B、近交
C、本交
D、回交
参考答案:D
— You were late again, Peter.
—Sorry, I ______ to be here on time, but the traffic on the roads _____ heavy.
A.wanted; was
B.had wanted; was
C.wanted; would have been
D.had wanted; would have been
哮病发作期属寒哮的治法是
A.健脾化痰B.补肾纳气C.温化宣肺D.补肺固卫E.清化肃肺