正确答案: B
气生叶
题目:慈姑具箭形、椭圆形和带形三种叶形,其中箭形叶是( )。
解析:B
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举一反三的答案和解析:
[单选题]在( )前,为了促成生根,常使用一些生长素。
扦插
[单选题]下列哪一条不是影响蒸发的因素( )。
液体黏度
[单选题]The school rules state that no child shall be allowed out of the school during the day, ______ accompanied by an adult.
unless
解析:本题考查省略的状语从句的连接词。句意应为“学校规章规定:除非有成年人陪同,否则孩子们在校期间不能出学校。”表示“除非”用unless。该句式构成了“连词+过去分词”结构。
[单选题]—It’s no use having ideas only.—Don’t worry. Peter can show you to turn an idea into an act.
how
[单选题]What do you mean, there are only ten tickets? There _____ be twelve.
shouldB .would
[单选题]
when
[单选题]植物细胞初生壁的主要成分是( )。
纤维素、半纤维素和果胶质
[单选题]The passage starts with an elephant story in order to explain that in India _________.
the man-elephant relationship is getting worse
解析:逻辑推理题。