A．for the highest price offeredB．at fixed pricesC．at pr……

填空题The icebergs are dangerous because they are hidden __ and can turn over unexpectedly.

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

填空题The author is ______ toward icebergs.

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

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

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

填空题His parents died in a motor accident when he was young so __________ (他是由一名监护人抚养大的).

单项选择题A．In the morning.B．Late at night.C．After 5: 30. ’D．At or before 5: 30.

问答题当今世界上，有越来越多的人对体育运动感兴趣； 2. 但有些人仍然不了解运动的重要性； 3. 体育运动有很高的价值。