单项选择题

南戏经过传播、发展到趋于成熟是（）。
A、宋代
B、由宋入元
C、元前期
D、元末

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选择合适从句补全对话。甲: Hi, Johnson, you’re looking for a cheap hotel, right? 乙: Yes. Do you have any suggestions? 甲: I saw some news about a youth hostel __1_ yesterday. I think you may be interested in it. It can save you lots of money. 乙: Great! I’ve wanted to find such a hotel _2. Thank you so much. 甲: Tell me more about the island _3. 乙: Sure. But can you take care of my dog _4? 甲: No problem. 第_3空选择从句______。
A、while I am away
B、when you come back
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D、since I decided to travel to that island

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在定轴轮系中，设轮1为起始主动轮，轮N为最末从动轮，则定轴轮系始末两轮传动比数值计算的一般公式是i1n=_________。 A.
轮1至轮N间所有从动轮齿数的乘积 / 轮1至轮N间所有主动轮齿数的乘积 B.
轮1至轮N间所有主动轮齿数的乘积 / 轮1至轮N间所有从动轮齿数的乘积 C.
轮N至轮1间所有从动轮齿数的乘积 / 轮1至轮N间所有主动轮齿数的乘积 D.
轮N至轮1间所有主动轮齿数的乘积 / 轮1至轮N间所有从动轮齿数的乘积