--- What do you think of the grammar book?--- Oh, it really is useful reference book, which is worth reading second time.A. a; a B. an; the C. an; D. the; the 题目和参考答案——青夏教育精英家教网—

题目内容

--- What do you think of the grammar book?

--- Oh, it really is ________ useful reference book, which is worth reading ________ second time.

A. a; a B. an; the C. an; D. the; the

【解析】

试题分析：第一空用不定冠词表示泛指，useful不是以元音因素开头，不用an ，要用a

；不定冠词a 与序数词连用表示“再，又”，不表示次序，故第二个空用a，表示再读一次。

故选A。

考点：考查冠词

练习册系列答案

黄冈经典阅读系列答案

文言文课外阅读特训系列答案

轻松阅读训练系列答案

南大教辅初中英语任务型阅读与首字母填空系列答案

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If you are sending a text message, watching TV or listening to the radio, you may stop and give this your full attention. Multi-tasking shrinks(使……萎缩) the brain, research suggests.

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Worryingly, the part of the brain that shrinks is involved in processing emotion. The finding follows research which has linked multi-tasking with a shortened attention span, depression, anxiety and lower grades at school.

The researchers began by asking 75 healthy men and women how often they divided their attention between different types of technology. This could mean sending a text message while listening to music and checking email, or speaking on the phone while watching TV and surfing the internet. The volunteers were then given brain scans which showed they had less grey matter in a region called the anterior cingulated cortex (ACC) (前扣带皮质). Scientists have proved that brain structure can be changed on exposure to fresh environments and experience.

Other studies have shown that training – such as learning to play magic tricks or taxi drivers’ learning the map of London – can increase grey-matter densities(密度) in certain parts.

Experts have also warned of the harmful impact technology can have on our memory and attention span. The University of California team conducted a survey of more than 18,000 people aged between 18 and 99, and found 20% had problems with memory. Researchers were shocked greatly by the 14% of 18 to 39-year-old people who also worried about their memories.

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