问题
解答题
要使24□5是3的倍数，□是可以填（ ）
A．3和6
B．1，4和7
C．1和0
D．2和5
答案
要使24□5是3的倍数，□是可以填1，4和7；
故选：B．
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要使24□5是3的倍数，□是可以填（ ）
A．3和6
B．1，4和7
C．1和0
D．2和5
要使24□5是3的倍数，□是可以填1，4和7；
故选：B．
How to get rid of waste is a great problem for the world today. Waste must be treated 16 it does not become a danger to life. 17 , in some countries, waste from factories is still poured straight into rivers. People who use the water from one of these rivers often get 18 . The water may become so polluted that it 19 all the fish in the river. When these rivers finally reaches the 20 , it pollutes the ocean. In many countries with 21 , human waste is piped directly into the sea without being dealt with. This is not 22 . Although the sea itself can break up the waste, beaches 23 become polluted. 24 scientists suggest people take the waste far out to sea in ships where the wind and waves break it down. In 1989 an international law was passed to 25 people putting waste into the sea. It is now against the 26 to put anything into the sea nearby. Such rubbish as plastics may not be thrown 27 the sea anywhere. Other waste may be put into the sea, either 19 or more than 40 kilometers from land, 28 the nature of the materials. The 29 of dealing with waste has become so great that several international organizations have been 30 to protect the world and control pollution.
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