32_______

【名词&注释】

纯合子(homozygote)、不可能(impossible)、维管形成层(vascular cambium)、形成层活动(cambium activity)

[单选题]32_______

A. pilot
B. baby
C. guard
D. man

举一反三：

[单选题]27______

A. led
B. chose
C. saw
D. fooled

[单选题]苹果属(Malus)与梨属(Pyrus)的区别在于花柱离生与否，果肉有无石细胞，果实形状。花红(林檎)属苹果属，则其( )。

A. 花柱离生，果肉无石细胞，果实苹果形
B. 花柱离生，果肉有石细胞，果实梨形
C. 花柱基部结合，果肉无石细胞，果实苹果形
D. 花柱基部合生，果肉有石细胞，果实苹果形

[单选题]On which days did the tourists spend most of their time on the boat?

A. Monday and Tuesday. B．Tuesday and Wednesday.
B. Wednesday and Thursday.
C. Monday and Wednesday.

[单选题]40____

A. questions
B. comments
C. explanations
D. remarks

[单选题]Excuse me, Marcia, a reporter from Vanity Fair ________ all day. Could you speak to her now?

A. phones B． has phoned
B. has been phoning D． phoned

[单选题]Edward, you play so well. But I _________ you played the piano.

A. didn't know
B. hadn't known
C. don't know
D. haven't known

[单选题]喷瓜有雄株、雌株和两性植株.G基因决定雄株.g基因决定两性植株。基因决定雌株。G对g、是显性。g对是显性.如：Gg是雄株.g 是两性植株.g 是雌株。下列分析正确的是

A. Gg和G 能杂交并产生雄株
B. 一株两性植株的喷瓜最多可产生三种配子
C. 两性植株自交不可能产生雌株
D. 两性植株群体内随机传粉.产生的后代中，纯合子比例高于杂合子

[单选题]根的维管形成层活动^{(cambium activity)}的结果是产生次生维管组织和髓射线。( )

A. 正确
B. 错误

[单选题]The settlement is home to nearly 1,000 people, many of left their village homes for a better life in the city.

A. whom
B. which
C. them
D. those

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