考点一:1cover这知识点是see sb doing sth2with这知识点是词组be covered with由……覆盖考点二:3①a number of②The number of4C这两个词组区别the number of……的数量。后面跟单数a number of许多。后面跟复数。考点三:6B例句中有waste of7D介词in后面通常加动词ing形式。再举例have difficulty in doing 做某事有困难。