30．Which of the following can replace the underlined phrase in Paragraph 2?

　　A．gaining money

　　B．1osing money

　　C．growing weak

　　D．promoting goods

　　31．What’s the main reason for aggressive crowds on Black Friday nowadays?

　　A．That people are eager to return home.

　　B．That sellers try to make shopping time longer.

　　C．That supplies are too limited to meet shoppers’ needs.

　　D．That shoppers rush to buy the cheapest goods.

　　D

　　Their beautiful call suggests the arrival of spring, but the routes taken by cuckoos(杜鹃) during their annual migration(迁徙) have remained a mystery. Now, though, scientists from the British Trust for Omithology(BTO) have revealed the details of their remarkable 10,000-mile journey, with the help of tracking devices.

　　Five male birds were caught in Norfolk last May and fitted with satellite-tagged “backpacks’’ before being released. The scientists then monitored their progress over 12 months as they flew to Africa in the autumn, and returned in the spring.

　　The project was carried out to discover why every year fewer of the birds return to Britain. Between 1995 and 2010，the population of cuckoos spending summer here fell by almost half, and the number is continuing to decline. Previously, the lack of information about the cuckoos’ long migration has hampered the understanding of how to help conserve the birds.

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