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【简答题】
p17 练习2 固定搭配 (cup of / piece of / bar of / drop of / lump of / bottles of / pairs of /不填) Let me give you a ___________ advice. He's only got a ___________ of chocolate. They haven't had a ___________ for at least two months. Would you like another ___________ coffee? Please bring us two ___________ beer. I need a ___________ sugar for my coffee. Mary gave each of them a ___________ cookie. Here are some new ___________ shoes.
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皮皮学刷刷变学霸
举一反三
【单选题】罗伯逊易位产生
A.
两个无着丝粒的染色体片段
B.
一个大的中着丝粒染色体和一个非常小的染色体
C.
一个大的中着丝粒染色体和一个大的无着丝粒染色体片段
D.
两个大的中着丝粒染色体
【简答题】罗伯逊易位