【C13】A．populationB．ratioC．proportionD．percentage

【C15】A．specialtyB．powerC．proportionD．place

【C7】A．ratioB．rationC．proportionD．rate

【C9】A．percentB．moneyC．percentageD．quality

Evidence showed only a small percentage of babies

Evidence showed only a small percentage of babies

52._________A.percentage B.group C.number D.propo