Which of the following best states the main idea of the passage?
A、It is easier to study medicine than music.
B、Painters and composers use totally different methods to reach the public.
C、All musicians must know how to time their own instruments.
D、Musicians must acquire technique and understanding to perform well.
If a person's family has had an ulcer, he is three times more likely to get ulcer than peoplewithout a family history of ulcers.
A、True
B、False
C、Not Given
下面的短文有10處空白，短文后列出12個詞，其中10個取自短文，請根據短文內容將其分別放回原有位置，以恢復文章原貌。A Thirsty WorldThe world is not only hungry;it is also thirsty for water. This may seem strange to you since nearly 75%of the earth's surface is 31 with water. But about 97%of this huge amount is sea-water, or salty water. Man can only drink and use the other 3%—the ____32___water that comes from rivers, lakes, underground, and other sources. And we cannot even use all of that, because some of itis in the form of icebergs and glaciers. Even ____33___, some of it has been polluted. At the moment, this small amount of fresh water is still enough for us. However, our demand for water is increasing 34 Only if we take steps to deal with this problem now can we avoid a severeworldwide water ____35___later on. In addition to stopping wasting our precious water, one useful step we should take is to 36ways of reusing it. Today, in most large cities, water is used only 37 and it eventually returns to the sea or runs into underground storage tanks, But it is ____38___to pipe water that has been used to a purifying(凈化) plant, There it can be filtered and treated with chemicals so that it can be used again just as if it were fresh from a spring. But even if every large city purified and 39 its water, we still would not have enough. Where could we turn next?To the oceans!We can make use of the vast amount of sea-water by re-moving the salt. This salt-removing 40 is already in use in many parts of the world.
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