In the final writing of your synthesis， you must explain each source material clearly to your readers.（）。

单项选择题Proposals usually appear in three forms：practical proposals，researched policy proposals and proposal speeches.。

单项选择题In most countries of the world the population is increasing alarmingly.This is especially true in poor， underdeveloped countries.Overpopulation causes a considerable number of problems.意为：世界上大多数国家的人口正以惊人的速度增长。在贫穷、不发达的国家尤其如此。人口过多引起了相当多的问题。