正确答案: A

石莼

题目：下列哪一种是绿藻门植物?( )

解析：A

查看原题

举一反三的答案和解析：

[单选题]Helping others is a habit, _______ you can learn even at an early age.

one

解析：本题考查代词的用法。句意应为“帮助别人是一种习惯，一个你在很小时就能学会的习惯。”空格处与前句中的habit构成同位关系，所以选择D项。句中you can learn even at an early age是省略了关系代词that 的定语从句，that在定语从句中作learn的宾语使用。

[单选题]

man

[单选题]毛茛科的( )植物已在适应虫媒传粉的方向上高度特化。

乌头属

[单选题]Why did the writer give his flowers to the elderly lady?

She gave him encouragement. D． She liked flowers very much.