几道高三英语单项求大神详解 ><

Question

In the poor parts of America's big cities there is a lot of crime, __C___ .
A. and many more is serious B. much of it is serious
C. and much of it is serious D. more of it is serious

I enjoyed very much the three years __A____ it had taken me to study English at school.
A. which B. what C. when D. how

In his address at two-day APEC Economic Leaders Meeting, President Hu ___B____ the APEC to reform itself to raise the efficiency of cooperation so as to keep advancing _______changing times.
A. called in; for B. called on; with
C. called for; at D. called at; through
In his lecture, the professor referred to the belief, in contrast to all other countries, ____the elderly are wise, ___is particularly dominant （占优势的）in the Chinese culture．
A．that; one that B．that; that C．which, which D．that; one

答案选A 第二空onethat 求解释

Answer 1

1.用and连接并列成分使其成为一句话，排除BD,crime前面是is,所以选C
2.Which引导定语从句，对前面的句子进行解释说明。
3.第一个填召集的意思所以是 called on; 后面一个空用with表伴随。
4.that引导同位语从句，one 指代all other countries,中的一个，that在从句充当主语的成分。