一、单项填空
1．(2011年重庆联考)Chinese herbs have proved effective against H1N1 in Ditan Hospital，Beijing________88 out of 117 patients treated for the disease only on the herbs fully recovered.
A．why          　    B．what
C．that      D．where
解析：选D。考查定语从句。先行词是Ditan Hospital，指地点，故用where引导定语从句。
2．(2011年成都模拟)The prices of houses，________is often reported，have been going up sharply in the past few months.
A．which      B．it
C限制性从句．as      D．what
解析：选C。as引导定语从句，它的位置比较灵活，常译为“正如……”。语意：正如报道的那样，房价在最近几个月涨得很快。
3．(2011年保定调研)Barack Obama delivered a speech to 500 local youths during his visit to China，many of________were from Fudan University and Tongji University.
A．them      B．whom
C．which      D．those
解析：选A。考查“介词＋关系代词”引导的定语从句。语意：我们收集了将近十万床被子，其中有半数以上送到了水灾地区。“介词of＋which”表示整体中的一部分，符合题意。