题目内容
第二节 完型填空
阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选择能填入相应空白处的最佳选项。
Two years ago I bought a bike. If you live in a town, it is often (1) than a car and you don't have to worry (2) parking(车辆的停放). You can (3) it anywhere.
(4) it has a seat at the back and a basket at the front, I can take my small daughter to school, to the library, shopping, anywhere in fact.
I use it mostly in summer (5) the weather is warm and dry. In winter when there is snow or ice on the road, it can be very dangerous(危险的)to go out (6) bike, so you have to be very (7) . Accidents(事故)are not the only problems though. One day I (8) on it and when I came out of the supermarket I found (9) front wheel (车轮)missing. It was a long walk to the bike shop!Now I (10) three strong locks.
(41)
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A．volcanoB．vitaminC．violateD．vague
下列合同属于无偿合同的是()。
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阅读下面文字，完成下面的问题
在地球之外，究竟有没有外星人？两位美国学者撰文说，他们花了5年时间，在北半球天空捕捉到37个可能是来自地球外文明的讯号。
这两位学者是利用直径为26米的射电望远镜．来寻找由浩瀚宇宙深处发出的未知讯号的。他们以波长2l厘米和10 5厘米的电波对北半球天空的全部区域分别进行了三次和两次调查。许多从事探索地球外文明的科学家认为，波长为2l厘米的电波在宇宙空间中极为普通，如果地 球外文明要向其他星体发出讯号，就很有可能会使用这个波长。
文中的“三次和两次”是指()。
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