283.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
284.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
283.答案是B;
此句考查倍数;此外,人口习惯用large和small修饰。
284.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。