22．Why does the author mention dinosaurs at the end of the passage?
A．Because they could only live in the warm climate.
B．Because they once dominated the earth.
C．Because their extinction indicates future disasters.
D．Because dinosaurs and humans never live in the same age.
答案：C 推理判断题。第三段中，作者描述假想的人类灾难……最后一段提到生活在地球上的恐龙在65 million years ago突然消失(即灭绝)，许多科学家相信地球曾受到过外空星体碎片的袭击，故而导致恐龙绝种。由此暗示人类未来的灾难。
23．In writing the passage, the author intends to________.
A．give an accurate description of the possible disaster in the future
B．prove that humans will sooner or later be destroyed
C．tell the historical development of the earth
D．warn of a possible disaster in the future
答案：D 观点态度题。本题要求考生推测作者意图。作者通过一段幻想的灾难和一段地球历史上出现过的恐龙绝迹的事实以及科学家们分析恐龙绝迹的原因，来警示人类未来可能发生的灾难。
