第2题:[单选题]They have given up the hope to save their friend from drowning. A.ended B.abandoned C.built D.strengthen 参考答案:B give up：放弃。abandon：放弃。例如：Mary has given up the hope of ever marrying.玛丽已经放弃了结婚的希望。Fearing further attacks , most of the population had abandoned the city．由于害怕城市进一步受到攻击，大多数人已经离开。end：结束，例如：The government acted to end a bakers' strike in the city．政府采取行动，结束了城里面包师傅的罢工。build：建立，加强，例如： Tension is building between the two nations．两国之间的紧张关系正在加剧。strengthen：加强，例如： Our friendship has steadily strengthened over the years．几年来，我们的友谊有了稳步增进。故答案为B。
第9题: [单项选择]Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien. A. insane B. infectious C. foreign D. poisonous 参考答案:C 答案解析:画线词alien．意为外国的，外来的，异己的，与foreign同义。辨义：A．insane疯狂的； B．infectious感染的；D．poisonous有毒的。
