[单项选择]
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The human species came into being at the time of the greatest biological diversity in the history of the Earth. Today, as human populations expand and alter the natural environment, they are reducing biological diversity to its lowest level. The ultimate consequences of this biological reduction are beyond calculation, but they are certain to be harmful. That, in essence, is the biodiversity crisis. The history of global diversity can be summarized as follows: after the initial flowering of multi-cellular animals, there was a swift rise in the number of species in early Paleozoic times (between 600 and 430 million years ago), then plate-alike stagnation for the remaining 200 million years of the Paleozoic era, and finally a slow but steady climb through the Mesozoic and Cenozoic eras to diversity’s all-time high. This his A. It was the most famous devastating extinction episode in history. B. It is the most devastating extinction episode up until now. C. It was less devastating to species diversity than is the current biodiversity crisis. D. The dinosaurs comprised the great majority of species that perished during the crisis. 查看答案 更多"{{B}}TEXT A{{/B}} The h"的相关试题: [单项选择] {{B}}TEXT A{{/B}} The human species came into being at the time of the greatest biological diversity in the history of the Earth. Today, as human populations expand and alter the natural environment, they are reducing biological diversity to its lowest level. The ultimate consequences of this biological reduction are beyond calculation, but they are certain to be harmful. That, in essence, is the biodiversity crisis. The history of global diversity can be summarized as follows: after the initial flowering of multi-cellular animals, there was a swift rise in the number of species in early Paleozoic times (between 600 and 430 million years ago), then plate-alike stagnation for the remaining 200 million years of the Paleozoic era, and finally a slow but steady climb through the Mesozoic and Cenozoic eras to diversity’s all-time high. This his A. The reduction in biodiversity represents a setback both for science and for society as a whole. B. The material and cultural wealth Of a nation are insignificant when compared with the country’s biological wealth. C. The human species is in the process of initiating an unprecedented massive extinction episode. D. The current decline in species diversity has potentially grave consequences for the human species. 查看答案 [填空题]Virtually all plant and animal species on Earth can be found in tropical rainforests. 查看答案 [单项选择] {{B}}TEXT B{{/B}} What happens when human beings are deprived of sleep for long periods of time To answer this question, a New Yorker, Peter Tripp, offered to stay awake 200 hours. During that time Tripp was observed by a group of doctors, who reported on his progress. After three days of staying awake, he began to show signs of mental breakdown. He laughed at things that were not funny, and wept at things that were not sad. Complaining of pressure caused by a hat on his head, he tried repeatedly to take it off. Tripp, of course, was not wearing a hat. On the fifth day he cried out that a doctor’s jacket looked like crawling worms. Then he imagined he was in another city; he tried to run away from the building, insisting it was on fire; and he thought the 200-hour mark had been passed but that doctors were "suffering from mental illness." He was nearly mad! Barely able to stand, Tripp was helped across the s A. There is little danger of serious after-effects when human beings are deprived of sleep for long periods of time. B. Going without sleep for a long period will cause bad shortlivede ffects, but apparently no serious after-effects. C. After 200 hours without sleep Tripp was suffering from "mental ill ness". D. The doctors predicted Tripp would sleep for twenty or thirty hours. 查看答案 [填空题] If the entire human species were a single individual, that person would long ago have been declared mad. The insanity would not lie in the {{U}} (1) {{/U}} of the human mind—though it can be a black and raging place indeed. And it certainly wouldn’t lie in the {{U}} (2) {{/U}}. The madness would lie instead in the fact that both of those qualities, the savage and the splendid, can exist in one creature, one person, {{U}} (3) {{/U}}. We’re a species that is capable of almost dumbfounding kindness. We nurse one another, {{U}} (4) {{/U}}, weep for one another. Ever since science taught us how, we willingly tear the {{U}} (5) {{/U}} and give them to one another. And at the same time, we {{U}} (6) {{/U}}. The past 15 years of human history are {{U}} (7) {{/U}} of those subatomic particles that are created in accelerators and {{U}} (8) {{/U}}, but in that fleeting instant, we’ve visited untold horrors on ourselves. As the {{U}} (9) { 查看答案 我来回答: 提交 最新试题 ●    肺胀形成的病因病机。 ●    肺胀的常见病因（） ●    胃痛发病的关键病机是（） ●    晚期血吸虫病的临床表现有（） ●    请用150字左右的篇幅概括出给定资料的主要内容。要求：语言简练、概括全面。 ●    女，48岁，临床诊断为宫颈鳞状上皮癌Ⅰb-Ⅱa期。宫颈癌普查最常用的方法是（）。 网站地图 我要搜题网  版权所有  ©2023  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码