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多项选择题

齿轮由哪些结构组成？
A、泵体、泵盖
B、齿轮、传动轴
C、安全装置
D、密封装置

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判断题
园林在文艺复兴时期，逐渐引申出不同于中世纪的观念，认为园林是健康之园，宁静之园，高尚之园。
未知题型
听力原文： My wife and I spent two weeks in London last year. We went there in the autumn. We think it is the best season to visit EnglanD.The weather is usually good and there aren't too many tourists in October. We stayed in a small hotel in the West EnD.It was convenient as we did most of our sightseeing on foot. Taxis were too expensive, we couldn't understand the bus routes, and my wife didn't like traveling on the undergrounD.She said it made her feel sick.
In fact, we enjoyed our holiday so much that we have already planned again for this year. We're going to take our umbrellas, though, I'm sure we'll need them sometimes.
My wife and I spent two weeks in London last year. We went there in the【11】We think it is the best season to visit EnglanD.The weather is usually good and there aren't too many【12】in October. We stayed in a small hotel in the West EnD.It was convenient as we did most of our【13】on foot. Taxis were too【14】, we couldn't understand the bus routes, and my wife didn't like traveling on the undergrounD.She said it made her feel sick.
In fact, we enjoyed our holiday so much that we have already【15】again for this year. We're going to take our umbrellas, though, I'm sure we'll need them sometimes.
未知题型
Doves flying in daylight use the sun for guidancE.But the stars are obviously their most important means of navigation. They find their way by such landmarks as mountains ranges, coastlines, and river courses. When it is too dark to see these, the doves circle helplessly, unable to get their bearings.
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