题目内容
A．They have accidents when they try to outrun other boats.B．They fall overboard when t
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A．regardlessB．in favorC．despiteD．on account
听力原文： A number of insects rely on leaping or jumping as a way of escaping from enemies. Grasshoppers probably have the most remarkable jumping ability of all these insects. If we think of it in human terms, a grasshopper's high jump is like a human jumping over a five story building. Imagine that a person jumping over a five story building. Welt, we'll take a look at the structure of grasshopper's leg to see why it's able to jump so well, but first I wanna talk about the sensory organ that tells grasshoppers when to jump in the first place. En, OK, a grasshopper has two sensory organs located at the end of its abdomen. Whenever these organs sense of change in air pressure which might be produced by an enemy approaching, an impulse is transmitted to the legs, this first impulse deactivates the nerves that control normal working and sets the grasshopper's jumping muscles into a sort of pre-jumping position. Now at this point, if the sensory organs don't detect additional air pressure changes, the jumping muscles relax and a grasshopper goes back to its normal walking. But if the organs continue to send danger, another set of impulses put the jumping muscles in motion. The distance of the jumping is determined by just how many impulses are transmitted in the second set, the more impulses the longer the jump. OK now let's see why the grasshopper can jump so far.
Whet does the professor mainly discuss？
听力原文： The young executive weaving through the traffic in his BMW, one hand on the steering wheel, the other holding a telephone, has become a familiar sight on our city streets. It doesn't look safe and it isn't. It is not just that the serous discussion he is having is distracting. There is also the tangled cable by the gear lever and the fact that he's only got one hand free if someone suddenly steps off the kerb.
Car phone have been available in Britain since 1959 but have only become common since January 1985 when two "cellular" systems were introduced. These are licensed by the government and take advantage of new technology and ultra-high radio frequencies. About 2500 subscribers were expected in the first years of operation but the actual figure for 1985 was more than double that. It is estimated that 75000 cellular phones were then in use, and there were well over 100000 by the end of 1986.
The Highway Code has been rewritten to include a warning that driver should not use hand-held telephone when the car is moving, because the drivers may concentrate more on the phone-work than the road ahead. Authority warns that those who drive and talk into a telephone will be prosecuted.
(30)
在谈话中案主出现比较激烈的情绪反应时,社工可运用的是()这种具有治疗作用的沉默。
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