13．As is known to all，the number of students in senior high school is increasing．

分析 眾所周知，高中學(xué)生的數(shù)量正在增加．

解答 答案：As
解析：分析句子結(jié)構(gòu)可知前面分句缺少主語，根據(jù)句意可知后一分句即為前面分句的主語；且前后句子之間有逗號，故本題考查as一詞引導(dǎo)的定語從句．As引導(dǎo)定語從句時(shí)可以用來指代整個(gè)句子，且位置靈活（可位于先行詞前也可位于先行詞后）；而which/that等關(guān)系代詞及其他關(guān)系副詞引導(dǎo)的定語從句只能位于先行詞后面（故本題不可使用這些引導(dǎo)詞）．

點(diǎn)評 本題考查單詞填空，做此類題目時(shí)一定要仔細(xì)分析句子結(jié)構(gòu)并根據(jù)所給提示及其它要求確定所填詞的正確形式．

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