There are many kinds of birds in Australia,and over 140 species of snakes,many of             
____are extremely dangerous.?
A．themB．which
C．whatD．those?
  B
   考查定語從句。依據(jù)空格后的are一詞可知，若選A、D兩項，兩分句間則缺少連詞；分析可知，句中的over 140 species of snakes是先行詞，這是定語從句，排除C項；which在此代指上文提及的140多種蛇。句意為：澳大利亞有許多種鳥和140多種蛇，其中的很多種蛇都極其危險。
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