（C）
The World Tourism Organization says that space will soon become a popular place to go on holiday—possibly by 2020. One Japanese company is planning a space holiday centre. It will look like a bicycle wheel and have a very modern hotel for 100 people and a park. It will travel round the Earth at a height of 300 km. The company hopes the centre will be ready in 2017. The company manager says he thinks that flying to the centre will probably be quicker than flying from Hong Kong to Singapore. After they arrive at the centre, tourists can take trips to the moon or go for walks in space. What about the cost? Well, the company believes that people will be happy to pay about $100, 000 for a trip. But they think that as more people want to go, the trip will become much cheaper.
An American company is also thinking of building a very modern hotel, called the Lunar Hotel, on the moon. Most of the hotel will be under the ground, so it won’t become too hot or too cold. The rooms will look just like they do on Earth. The guests will eat normal food for lunch. The cooks will just push a button（按钮）to mix dried food with water to become a meal! There will be little or no dirt（尘土）and there won’t be much water. So the hotel won’t wash the towels and sheets（床单）—they will be thrown away.
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根据对话内容，从方框内选出能填入空白处的最佳选项。其中有两项为多余选项。A: Hey, Bruce! You seem unhappy. 66
B: Yes. I’ve just come back from the zoo.
A: Have you seen your favorite tigers?
B: Yes. 67
A: Why not?
B: Because they had to stay in cages（笼子）and they were dirty.
A: 68 I think they should go back to forests or mountains.
B: Even worse, a few children threw something at them.
A: That’s too bad. 69
B: Of course. I also told them it was our duty to protect animals.
A: 70 Protecting them is protecting ourselves.