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第三节 回答问题（共3小题；每小题2分，满分6分） 阅读下面短文，根据第58至第60小题的具体要求，简要回答问题，并将答案转写到答题卡上。 For Americans, a mosquito bite is an itchy(使人发痒的) bother, but for many in Africa, a tiny bite can be deadly. One million people die each year of malaria, a disease spread by infected mosquitoes. Most of these people live in Africa, and are under age 5. Malaria can be prevented and treated. However, many African nations don’t have the funds to fight it. Nothing but Nets (NBN) hopes to change that从甲堆煤中取出给乙堆，则两堆煤相等，原来甲、乙两堆重量的比是A.7：5B.7：2C.7：3D.9：7