Under the present system, __________ (国有企业必须将全部利润上缴国家).

填空题You’d better vary your diet __________ (不要总吃同样的东西).

单项选择题A．At ll’clock.B．At 4 o’clock.C．At 7 o’clock.D．At 2 o’clock.

填空题refreshments

单项选择题A．The train is faster than the bus.B．There are two buses every day.C．The bus is cheaper than the train.D．The train is cheaper than the bus.

单项选择题A．The discussion.B．The European Union team.C．The European Union deputy foreign ministers.D．The UN investigation.

填空题extra

填空题__________ (他们太埋头从事科学研究), not knowing what happened just outside their lab.

填空题Only the hardiest animals __________ (才能在严寒中生存).

填空题The author is ______ toward icebergs.

填空题How can we account for the formation of an iceberg