48______

【名词&注释】

均田制(equally dividing field system)、十字花科(cruciferae)、顶端优势(apical dominance)、农业生产经营(agriculture production and management)、头状花序(head)、总状花序(raceme)

[单选题]48______

A. from
B. rough
C. black
D. smooth

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学习资料：

[单选题]We can infer from the last paragraph that the e-nose_____.

A. is unable to tell the smell of flowers
B. is not yet used in greenhouses
C. is designed by scientists at Purdue
D. is helpful in killing harmful insects

[单选题]北魏首创均田制，隋至唐初一直沿用。均田制下农业生产经营的主要形式是

A. 众人集体生产
B. 田庄规模生产
C. 个体农户耕作
D. 官府募民耕作

[单选题]One of the most important questions they had to consider was( ) of public health

A. what
B. this
C. that
D. which

[单选题]杯状花序属特化的( )。

A. 聚伞花序
B. 总状花序^(raceme)
C. 伞形花序
D. 头状花序^(head)

[单选题]移栽菜苗时，一般将根除掉一截，目的是除掉顶端优势，促进侧根的发生。( )

A. 正确
B. 错误

[单选题]十字花科的雄蕊类型是( )。

A. 单体雄蕊
B. 二体雄蕊
C. 多体雄蕊
D. 四强雄蕊

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