icycles have several advantages besides being affordable.firstly，they do not consume natural resources of petroleum.secondly，they do not cause the pollution problem.last but not least，they contribute to people’s health by giving them due physical exercise.

　　9.表示数量

　　1)it has increased(decreased)from...to...

　　2)the population in this city has now increased (decreased)to 800，000.

　　3)the output of july in this factory increased by 15% compared with that of january.

　　例如：

　　with the improvement of the living standard，the proportion of people’s income spent on food has dec reased while that spent on education has increased.

　　再如：

　　from the graph listed above，itcan be seen that student use of computers has increased from an average of less than two hours per week in 1990 to 20 hours in 2000.

　　注：“from the graph listed above，it can be seen that”见句式12。考生将句式9和句式12结合在一起，有时便可较好地写出句子。

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