【名词&注释】
生长素(auxin)、成年人(adult)、主要成分(main components)、过去分词(past participle)、椭圆形(ellipse)、孩子们、连接词。、初生壁(primary wall)、推理题(inference question)
[单选题]慈姑具箭形、椭圆形和带形三种叶形，其中箭形叶是( )。
A. 沉水叶
B. 气生叶
C. 漂浮叶
D. 完全叶
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举一反三：
[单选题]在( )前，为了促成生根，常使用一些生长素。
A. 分离繁殖
B. 扦插
C. 压条
D. 嫁接
[单选题]下列哪一条不是影响蒸发的因素（ ）。
A. 药液蒸发面的面积
B. 液体黏度
C. 搅拌
D. 加热温度与液体温度的温度差
E. 蒸汽的压力
[单选题]The school rules state that no child shall be allowed out of the school during the day, ______ accompanied by an adult.
A. once
B. when
C. if
D. unless
[单选题]—It’s no use having ideas only.—Don’t worry. Peter can show you to turn an idea into an act.
A. how
B. who
C. what
D. where
[单选题]What do you mean, there are only ten tickets? There _____ be twelve.
A. shouldB .would
B. will D． shall
[单选题]
A. when
B. while
C. how
D. why
[单选题]植物细胞初生壁(primary wall)的主要成分是( )。
A. 纤维素、半纤维素和果胶质
B. 木质、纤维素和半纤维素
C. 果胶和木质
D. 角质和纤维素
[单选题]The passage starts with an elephant story in order to explain that in India _________.
A. people easily fall victim to elephants' attacks
B. the man-elephant relationship is getting worse
C. elephant tamers are in short supply
D. dogs are as powerful as elephants
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