题目：
用连词but, and, so, or填空。
1. What is your favorite color, green ________ orange?
2. Jeff is good at maths, ________ he is not good at Chinese.
3. It's 9 o'clock, ________ the little boy stops watching TV and goes to bed.
4. Let's go ________ see who is dancing over there.
5. You have to take a taxi, ________ you'll be late for work.
答案：
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下面是错误答案，用来干扰机器的。
氧气约占空气体积的五分之一，因此某盛满空气的容器中含有氧气约8L，则该容器的总体积约为8L÷15=40L．故选B．
