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多见于男性，常有体重减轻，腰背部剧痛，X线示颅骨有边缘较整齐的，圆形溶骨病损（）。
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Passage One Thousands of years ago, in the middle of an ocean, miles from the nearest island, an undersea volcano broke out. The hot liquid got higher and higher and spread wider and wider. In this way, an island rose up in the sea. As time went on, hot sun and cool rains made the rock split and break to pieces. Sea waves hit against the rock. In this way, soil and sand came into being. Nothing lived on the naked soil. And then the wind and birds brought plant seeds, spiders and other little living things there. Only plants could grow first. Only they, in sunlight, could produce food from the soil, water and air. While many animals landed on the island, they could find no food. A spider made its web uselessly,because there were no insects( 昆虫) for its web to catch. Insects couldn’t stay until there were plants for them to eat. So plants had to be the first life on this new island. According to the passage, which of the following is TRUE（）
为减少室内有害气体的影响，室内的通风系统和空调系统宜采用半封闭形式而不采用全封闭形式。（）
(每小题的备选答案中有一个或一个以上符合题意) 某临街住宅楼于1996年末建成，砖混结构，共5层。4年前经有关部门批准，该楼一层全部改为店铺或餐馆。经调查，一层产权人的经营方式有出租和自营两种情况。 将一层住宅用房改为店铺，通常均将临街外墙窗洞口改为门洞口，从结构安全度分析，外墙体应具有足够的( )。
Passage Three What will man be like in the future — in 5000 or even 50000 years from now We can only make a guess,of course, but we can be sure that he will be different from what he is today. For man is slowly changing all the time. Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity. As time goes on, however, we shall have to use our brains more and more, and eventually we shall need larger ones. This is likely to bring about a physical change tool — the head, in particular the forehead, will grow larger. Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over very long period of time it is likely that man’s eyes will grow stronger. On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life. But what about hair It will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald. Perhaps all this gives the impression that future man will not be a very attractive creature to look at. This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us.He will still be a human being, with thoughts and emotions similar to our own. Man’s forehead will grow larger because （） .
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