There are many kinds of birds in Australia,and over 140 species of snakes,many o

题型：不详难度：来源：

There are many kinds of birds in Australia,and over 140 species of snakes,many of             
____are extremely dangerous.

A．them	B．which
C．what	D．those

答案

  B

解析

   考查定语从句。依据空格后的are一词可知，若选A、D两项，两分句间则缺少连词；分析可知，句中的over 140 species of snakes是先行词，这是定语从句，排除C项；which在此代指上文提及的140多种蛇。句意为：澳大利亚有许多种鸟和140多种蛇，其中的很多种蛇都极其危险。