诊断前置胎盘较安全可靠的方法是（）。
A．放射线检查
B．B型超声检查
C．肛门检查
D．化验检查
E． * * 检查
参考答案：B
解析：
前置胎盘基本异常发生在胎盘位置较低，低于胎儿先露部。在检查时一定注意不能增加其出血的可能性，肛门检查和 * * 检查可以增加出血的可能，化验检查不能发现其位置问题，放射性检查不适合孕妇使用，只有B超检查不增加其出血可能，同时可以达到确定胎盘位置的目的。
Qi Haoran, a Junior One student at High School was quite busy over the last winter vacation, not just with homework. Qi, together with ten other classmates made a group to call on people to join the Clean Your Plate Campaign(光盘行动). The students went to many restaurants and told the people the importance of food. “ Excuse me, do you know that 950 million people around the world still haven’t got enough to ? Could you please not food? ” They would say this kind of thing hundreds of times every day. ，the activity has got the support of many people. In a restaurant in Xinjing, the owner gives the guests who have eaten all the food they ordered a ticket. People can enjoy a meal when they have ten tickets. More than 750 restaurants in Beijng have begun to offer dishes and encourage their guests to take leftovers(剩菜) home. Wasting food is a serious problem around the , not only in China. It’s said that 1.3 billion tons of food ends up as waste last year. This is as as one third of all the food in the world. The UN Environment Program and the Food and Agriculture Organization held a “ Think, Eat, Save” program in January, 2013 to help reduce food waste.
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