Having a trip abroad is certainly good for the old couple, but it remains ______whether they will enjoy it.

A. to see B. to be seen

C. seeing D. seen

B

【解析】

試題分析：考查固定搭配。句意：出國旅游對于那對老人來說當(dāng)然是件好事情，但是，他們對旅行是否滿意還有待觀察。It remains to be seen whether...“是否......還有待觀察”，故選B。

考點(diǎn)：考查固定搭配

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Tibet is an 1. site for tourists, but altitude sickness will be probably along with tourists.

Causes

Altitude sickness 2. from low oxygen content and air pressure and dry weather.

3.

◇Headache, shortness of breath, oppressed feeling in the chest, lack of appetite, fever, dizziness, fatigue or weakness, etc.

Prevention

◇Human bodies can adapt to the surroundings 4. .

◇Visitors can take some useful5. in advance so as to avoid altitude sickness.

◇Visitors can take some 6. to help prevent the occurrence of altitude sickness.

◇The people with7. symptoms should avoid traveling to Tibet.

8.

◇Proper rest, considerate preparation, and enough oxygen uptake can help to 9. altitude sickness.

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