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【单选题】
两个正数1、9的等差中a，等比中b，则曲线 x 2 a + y 2 b =1 的离心率为（ ）A.
10 5
B.
2 10 5
C.
4 5
D.
10 5 与 2 10 5
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举一反三
【单选题】It is very important that you let your children know you feel love and concern for them．
A.
right
B.
wrong
C.
Not mentioned
【单选题】He goes _____ at 8 a.m. and comes _____ at 5 p.m. Today he is _____.A．on duty; off duty; on nigh
A.
49. He goes _____ at 8 a.m. and comes _____ at 5 p.m. Today he is _____. A．on duty; off duty; on night duty
B.
on his duty; off the duty; on night duty
C.
to duty; from duty; at night duty
D.
in duty; out duty; at night duty
【单选题】It is very important that you let your children know you feel love and concern for them.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Some evidence threw doubt on ______ he had lent the money to the defender.
A.
if
B.
which
C.
that
D.
Whether
【单选题】听力原文： Hello, this is Jack in technical services. I am calling you to let you know that we were able to fix the problem with your computer. It should no longer randomly reboot. We would like to return ...
A.
To inform. on the status of the problem.
B.
To request a reply.
C.
To place an order.
D.
To repair the computer.
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