Evans said that global warming over the past decade was playing a key role in transforming bird movements across the world. In addition, melting Arctic sea ice may also be opening up bird flight paths over the North Pole, making it easier for birds from the Pacific — such as the slaty-backed gull and tufted puffin, both of which appeared in London earlier this year — to reach Britain.

　　Bird-watching is becoming an increasingly popular hobby among all age groups, added Evans. “A fifth of our members are under 18. This is a round-the-year hobby that you can enjoy from the kitchen window or from a car. More and more people are bird-watching, and as a result more and more unexpected species are being spotted in the British Isles.”

　　1. What is the passage mainly about?

　　A. The results of global warming.

　　B. Changes in the British bird population.

　　C. Increasing environmental pollution.

　　D. Worsening British weather.

　　2. The underlined word “knackered” is closest in meaning to __________.

　　A. bored

　　B. knocked

　　C. spotted

　　D. tired

　　3. How many more bird species are needed to equal the British bird-watching record?

　　A. 3.

　　B. 4.

　　C. 442.

　　D. 445.

　　4. According to the passage, which of the following birds comes from Asia?

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