D. Attempts to control the energy cycle of other family members.

　　答案：

　　3. If one wants to work more efficiently at his low point in the morning, he should___________.

　　A. change his energy cycle

　　B. overcome his laziness

　　C. get up earlier than usual

　　D. go to bed earlier

　　答案：答案：答案：答案：答案：答案：

　　Imagine putting a seed in a freezer, waiting 30,000 years, and then taking the seed out and planting it. Do you think a flower would grow?

　　Amazingly, scientists have just managed to do something very similar. They found the fruit of an ancient plant that had been frozen underground in Siberia — a region covering central and eastern Russia — for about 31,800 years. Using pieces of the fruit, the scientists grew plants in a lab. The new blooms have delicate white petals. They are also the oldest flowering plants that researchers have ever revived from a deep freeze.

　　“This is like regenerating a dinosaur from tissues of an ancient egg,” said University of California, Los Angeles biologist Jane Shen-Miller.

　　The plant has a long history. Back when mammoths and woolly rhinoceroses walked the land, an Arctic ground squirrel buried seeds and fruits in an underground chamber near the Kolyma River in northeastern Siberia. The ground became permafrost, a layer of soil that stays frozen for a long time.

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