单选题 The report shows that over half of the women are suffering _____ second-hand smoke at the workplace.
in
for
on
from
单选题 I became a teacher because I preferred books and people _____ politics.
than
to
rather
against
单选题 Many companies provide their employees _____ free lunch during the weekdays.
by
with
to
for
单选题 已知PQ是圆 的弦,PQ的中点是(1,2),则直线PQ的方程是( ).
x+2y-5=0
x+2y-3=0
2x-y+4=0
2x-y=0
单选题 方程x2+xy=x的曲线是( ).
一个点
一条直线
两条直线
一个点和一条直线