1 . Today’s children spend ________ average of four and a half hours a day looking at screens, split between watching television and using the Internet. (用适当的词填空)
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2 . Volunteering provides _________ opportunity to give back to the community and help those in need. (用适当的词填空)
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3 . Like many undergraduate biology students, Wang Fang was taught that pandas are a prime example of ________ umbrella species — a well-known and usually endangered animal.(用适当的词填空)
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4 . There was __________ explosion of bright colors and lively music, and the group jumped into action. (用适当的词填空)
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5 . __ average of just 15 cm of rainfall(降雨量) last year has made it the driest year since 1850.
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6 . Visiting Cairo has been ___________ unforgettable experience, even with the terrible heat! (用适当的词填空)
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7 . Start of Autumn reflects the end of summer and the beginning of autumn. Although autumn just begins, hot weather will not come to ______ end. (用适当的词填空)
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8 . Wild is ______ one-hour documentary on CCTV. I have never seen such ________ exciting programme.
| A．a; an | B．an; a | C．a; a | D．an; an |
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9 . Sugar is not ______ important element in bread, but flour is essential. (用适当的词填空)
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10 . Two years ago he bought expensive camera and then he persuaded me to buy .
| A．the; the one | B．a; one | C．the; the one | D．an; one |
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