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【单选题】
已知数列{a n }是各项均为正整数的等比数列，数列{b n }是等差数列，且a 6 =b 7 ，则有（ ）A.
a 3 +a 9 ≤b 1 +b 10
B.
a 3 +a 9 ≥b 4 +b 10
C.
a 3 +a 9 ≠b 4 +b 10
D.
a 3 +a 4 与b 1 +b 10 的大小关系不确定
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【单选题】–My TV set doesn’t work, the water tap is dripping and my car is still under repair! –You sure ________ bad luck these days.
A.
had
B.
will have
C.
had had
D.
are having
【单选题】—Is this a TV or a computer? —________. [ ]
A.
Yes, it is.
B.
No, it isn't.
C.
Yes, it's
D.
It's a TV.
【简答题】It's very (er) ________ to repair the TV set like that.
【简答题】The TV doesn’t work. It _____ ______ ______(repair) tomorrow.
【单选题】—Must I go and repair our TV set this afternoon? —No, you _______. I've repaired it. [ ]
A.
mustn't
B.
needn't
C.
shouldn't
D.
wouldn't
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