杂交一代（F1）品种的主要特点是（）A.基因型高度纯合、性状表现

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问题单项选择题

杂交一代（F1）品种的主要特点是（）

A.基因型高度纯合、性状表现高度一致

B.基因型高度纯合、性状表现不一致

C.基因型高度杂合、性状表现高度一致

D.基因型高度杂合、性状表现不一致

答案

参考答案：C

听力题

选择括号内恰当的单词或词组填入空白处，使句意完整、正确。

小题1:—Could you tell me who can help me repair the machine?

—I think Jack could be the right person. He is an excellent （engineer / fisherman）

小题2:—How long has Mr. Green lived in Quanzhou?

—He has lived here （for / since）1999.

小题3:We will soon （get used to / used to）the life in Beijing.

小题4:Did you ever hear that the sun （rises / raises）in the east and sets in the west for ever?

小题5:—Is your grandfather still alive?

—No, he has been （died / dead）for three years.

单项选择题

项目监理机构的总监理工程师代表，应处于( )。

A．决策层
B．协调层
C．操作层
D．执行层