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【简答题】
如图，两等圆⊙O 1 、⊙O 2 相交于A、B两点，且两圆互相过圆心，过B作任一直线，分别交⊙O 1 、⊙O 2 于C、D两点，连接AC、AD． （1）试猜想△ACD的形状，并给出证明． （2）若已知条件中两圆不一定互相过圆心，试猜想三角形的形状是怎样的？证明你的结论． （3）若⊙O 1 、⊙O 2 是两个不相等的圆，半径分别为R和r，那么（2）中的猜想还成立吗 ？若成立，给出证明；若不成立，那么AC和AD的长与两圆半径有什么关系？说明理由．
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【简答题】Complete the following sentences by choosing the correct word from those given in brackets. 22. We have done (many, much) work today.
【单选题】We______the last bus and didn't have any money
A.
22. We______the last bus and didn't have any money fortaxi, so we had to walk home. ( 全国 1) A. reached
B.
lost
C.
missed
D.
caught
【单选题】We are late. I expect the film____ by the time we get to the cinema.
A.
has started
B.
will have started
C.
will start
D.
may start
【单选题】—Have you heard today’s weather forecast?—Yes. Better weather is____. We can expect an outing. A．
A.
22.—Have you heard today’s weather forecast? —Yes. Better weather is____. We can expect an outing. A．in the way
B.
by the way
C.
in this way
D.
on the way
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