Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’S computers？
A. Because it is extremely dangerous to conduct such research on an airplane．
Because it remains a mystery what wave—lengths are liable to be interfered with．
C. Because scientists have not been able to produce the same effects in labs．
D. Because experts lack adequate equipment to do such research．
查看答案
Kate：Do you mind opening the door for me？Bob：__________．
A. Yes，I"ll do itl
B. It’S nothing
C. That’S all right
D. Not at all
A.privateB.personalC.oneD.own
A. private
B. personal
C. one
D. own
Jack，s university education gave him__________ over boys who had not been to college.
A. a benefit
B. a profit
C. a view
D. an advantage
He didn’t __________and SO he failed the examination．
A. work enough hard
B. work hard enough
C. hard work enough
D. hard enough work
微信支付 
支付宝支付