单项选择题

用急救板固定和运送溺水者至少需要（）名救生员。

A、1
B、2
C、3
D、4


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Passage 2
Does it seem like hotel costs just go up and up? It’s true that they rise each year. Rates for rooms in 2019 are over 15% more than 2018. Here are some tips to help you make the best decision.
Look for extras.
The more services your rate includes, the more you can save your money. Make sure you use the facilities you will actually need, or you’ll spend more than you need to. Common extras that can save you a lot are free breakfast, free Wi-Fi, and kids eat free. So take advantage of them during your stay.
Stay in hotels right outside the city center.
If the costs for transportation won’t be high, you can frequently get a good deal this way. You could also look into staying in the university district of a city. Hotels are more affordable , cheap eating places are plentiful and public transportation is convenient. 
Go out to eat.
Though room service sounds really great, prices for food on the hotel menu can be twice as much as you would pay for the same food at a restaurant. 
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类是对象的抽象，对象则是类的具体化。在窗体上建立的一个控件称为______。

A．实体
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