单选题 Text
An animal species becomes extinct when it fails to produce enough young in each generation to keep pace with the death-rate. We can (26) from fossil evidence in rocks that many living species have become extinct over the millions of years (27) life began. It is a natural (28) and extinction is the (29) of any animal that has specialized too far to change (30) its environment changes, or has to compete with a better- (31) and more powerful animal. (32) remarkable technical developments during the past few centuries, man has destroyed or (33) destroyed some species by killing them (34) such a rate that they couldn't produce enough offspring, or by completely changing their natural environment at surprising speed.
A number of examples can be given of the way (35) which natural environments are being rapidly changed—Amazonia, for instance. There is every (36) that many species of animals will be made extinct because of these and similar (37) of natural vegetation. Large numbers of animals have been hunted and killed for food. The North American buffalo is a (38) of the near-extinction of a species through hunting. Often the numbers are (39) great that the hunters may not realize the danger. But even when the danger is widely (40) , the financial rewards for the hunters may be so great that they choose to (41) the threat to the species. Attitudes like this have (42) to hunters killing animals for furs, for ivory or merely for ornaments. A slight (43) on this is when tourists hunt animals for trophies. Such magnificent creatures (44) lions and tigers (45) out of existence in some parts of the world.

【正确答案】 A
【答案解析】A选项tell除了有讲述意义外还可作判断。B选项secure“使安全、使可靠、得到、获得”。C选项draw“拉、画”，D选项separate“分开”。根据词义故选A。
【正确答案】 C
【答案解析】根据上下文，此处应用since“自从”最为合适。
【正确答案】 C
【答案解析】A选项scheme“安排、配置、计划、阻碍”，B选项意为“选择”， C选项process“过程”，D选项presence“列席、出席、在场”。根据文中题意，C选项最合适。
【正确答案】 D
【答案解析】A选项defect“缺点”，B选项fault“错误”，C选项destination“灭绝”，D选项fate“命运”。
【正确答案】 D
【答案解析】由常识动物不能随环境变化而变化就会灭绝，所以用when表示“当…时候”最为恰当。
【正确答案】 D
【答案解析】A选项“隔离、孤立”，B选项“采用”，C选项“沉溺、嗜好”，D选项adapted“使…适应”。所以D选项最为合适。
【正确答案】 A
【答案解析】根据题意“正是有了技术进步才会有摧毁自然的力量”，故C选项because of“因为”最为合适。
【正确答案】 B
【答案解析】A选项“必要地”，B选项“几乎”，C选项“几乎没有、仅仅”，D选项“富足地”，所以选B。
【正确答案】 A
【答案解析】考察介词，以…速率的介词搭配为at a rate，所以选A。
【正确答案】 D
【答案解析】in the way“以…方式”，改为非限制性定语从句之后就为the way in which，所以选D。
【正确答案】 C
【答案解析】A选项hope“希望”，B选项similarity“相似性”，C选项opportunity“机会”，D选项“可能性”。所以选C。
【正确答案】 C
【答案解析】自然植被遭破坏经历一个从有到无的过程，只有clearances (一扫而光)能传神表达出来。
【正确答案】 B
【答案解析】北美洲的“buffalo”显然是因捕猎而濒临灭绝的一个例子，应填case。其他不合题意。
【正确答案】 B
【答案解析】such接名词，so接形容词或副词。too一般与to并列使用，太…以致于，very非常。在此，后面出现great，所以用so比较合适。
【正确答案】 D
【答案解析】A选项risked“冒险”，B选项“不时打断”，C选项“避免”，D选项“公布于众”最合题意。
【正确答案】 C
【答案解析】根据题意，此题容易选择，选C。
【正确答案】 A
【答案解析】A选项“引导”，B选项“产生”，C选项“归功于”，D选项“转向”，根据词义，故选A。
【正确答案】 D
【答案解析】A选项concentration“集中”，B选项“变化多样”，C选项“演示”，D选顷“变化”，所以选D。
【正确答案】 A
【答案解析】such... as是固定搭配，所以选A。
【正确答案】 C
【答案解析】根据文中题意，此处应该填入被动、完成时，所以选c。