题目

Five and a half billion people across the world live without a household toilet. Hundreds of millions of people are using facilities that are unhealthy and more than a billion people defecate (排泄) in the open.Michael decided to take action in response to what is one of the world’s greatest public health crises. He invited 32 health workers from 16 communities in the southern Highlands of Madagascar to attend a training to organize communities to completely wipe out open defecation.After completing the initial training, the 32 health workers returned to their towns and got to work. They m一个数乘以它的倒数，积一定是1． （判断对错）．