D. It depends on Bluetooth technology.

　　31. It can be inferred from the last two paragraphs that ______.

　　A. the electronic circuit is a little larger

　　B. it’s very easy to make a Bikealarm

　　C. it costs too much at present

　　D. not many Bikealarms are produced

　　D

　　Professional footballers have worryingly poor teeth that could be affecting their performance on the football ground, say dentists. Their study on players at eight clubs in England and Wales, in the British Journal o f Sports Medicine, showed nearly 4 out of 10 had cavities （蛀牙) and that athletes often had worse teeth than the general population. Regularly taking sugary foods is one possible explanation.

　　The dentists, from the International Centre for Evidence-Based Oral Health at University College London, examined 187 players' sets of teeth. They found 53% had dental erosion (腐蚀), 45% were bothered by the state of their teeth and 7% said it affected their ability to train or play. Around 40% had cavities, compared with 30% of people of a similar age in the general population.

　　Prof Ian Needleman, one of the researchers, said:

　　"These are individuals who otherwise invest so much in themselves so it’s a surprising finding.

　　"There are two main groups - some have a catastrophic effect, they have very serious disease that stops them in their tracks and they cannot play or train.

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