青蒿素属于( )
A．单萜B．倍半萜C．二萜D．二倍半萜E．三萜
参考答案：B
解析：[知识点] 萜类的分类
根据句意，用括号内所给词的适当形式填空。
小题1:The famous ________________(direct) names are almost well known to all in China .
小题2:Seven ______________(twelve) of the students have been to the exhibitions.
小题3:What he said drove her even ________________(mad).
小题4:How _____________(noise) the children are playing on the playground!
大自然是人类赖以生存的基础，我们只能做它的奴隶。 [ ]
