词语运用 阅读短文,从方框中选择适当的词并用其正确形式填空,使短文通顺、意思完整。每空限填一词,每词限用一次。方框中有两个词是多余的。 always talk count I below friend or people send free around and Next time you're in a public place, take a look around you. And 1 how many people are using their phones. I can tell you now that it is probably more than half, whether you're on a bus, in a caf6 2 simply walking down the street. I'm not saying that I am not an example of
在孟德尔进行的两对相对性状的遗传实验中,具有1∶1∶1∶1比例关系的是
①杂种F1自交后代的性状分离比例
②杂种F1产生配子类型的比例
③杂种F1测交后代的表现型比例
④杂种F1自交后代的基因型比例
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A.①②④
B.②④
C.①③
D.②③