285.Ten years ago the population of our village was ______ that of theirs.
A.as twice large as
B.twice as large as
C.twice as much as
D.as twice much as
286.A survey of the opinions of experts _________ that three hours of outdoor exercise a week ______ good for one's health.
A.show;are
B.shows;is
C.show;is
D.shows;are
285.答案是B;此句考查倍数；此外，人口习惯用large和small修饰。
286.答案是B；考查主谓一致。由a survey可知第一空用shows;此外，一段时间，一笔钱，一段距离等作主语时，谓语用单数。
