I live too far ____________ school. [ ]
A. to
B. from
C. of
D. at
答案：B
— Lucy looks blue today.
— Yes, but I don't know what it is________makes herso upset. [ ]
A. as
B. what
C. that
D. which
我们在江河水质监测时，对照断面应设在（）
A.污染源的上游
B.污染源的对岸
C.紧靠污染源的下游
D.远离污染源的下游
E.另找一条清洁江河
