人的卷舌和不卷舌是由一对等位基因(R和r)控制的。某人不能卷舌，_爱下问搜题

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问题选择题

人的卷舌和不卷舌是由一对等位基因(R和r)控制的。某人不能卷舌，其父母都能卷舌，其父母的基因型是[ ]

A．RR、RR

B．RR、Rr

C．Rr、rr

D．Rr、Rr

答案

答案：D

选择题

Look at the trouble I am in! If only I _____ your advice. [ ]

A. followed

B. would follow

C. had followed

D. should follow

选择题

The news soon ___ its way throughout the country.

A．noticed

B．found

C．watched

D．set