() 6. We were walking home yesterday a large dog appeared out of nowhere and frightened us to death. A. when B. while C. as D. before 题目和参考答案——青夏教育精英家教网—

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() 6. We were walking home yesterday a large dog appeared out of nowhere and frightened (吓唬) us to death.

A. when B. while C. as D. before

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In the Caucasus Mountains,nearly 50 out of every 100,000 people live to celebrate their 100th birthday,and many don't stop at 100!In America only 3 people in 100,000 reach 100. But these old people aren't alone. The people who live high in the Himalaya Mountains and the Andes Mountains seem to share the secret of long life,too.

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