A)larger than B)as great as C)more than D)as many as 34.All that can be done ___. A)have been done B)have done C)has done D)has been done 35.A person beating a drum or blowing a trumpet causes vibrations in the air ___ sound waves. A)...
12. As can be seen in the graph, we saw great changes in between and . 从图表可知,在到 之间, 发生了巨大变化。 13. Recently, the rise in the problem of has aroused public/wide concern. 近来, 问题的增加已经引起了公众/广泛的关注。
There is little that can be done to stop population ageing, so the world will have to live with it. But some of the consequences can be alleviated. Many experts now believe that given the right policies, the effects, though grave, need not be catas...
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