题目内容
（请给出正确答案）
A．They were unable to fold their wings when not in use.
B．They hung upside down from branches as bats do before flight
C．They flew in order to capture prey.
D．They were an early stage in the evolution of the birds.
安装简答题APP，拍照搜题省时又省心！
更多“It can be inferred from the pa…”相关的问题
“While the increase in carbon dioxide in the atmosphere is the main effect of global warming, there are other effects as well. For example, there is a marked increase in infectious diseases that have changed their range in the past few years. Cases of malaria and dengue fever have occurred as far north as New York, New Jersey and Michigan in recent years, and diseases such as encephalitis and becoming more common. The sea level has changed, affecting low-lying areas and destroying beaches and wetlands around the world. Glaciers and snow cover are gradually disappearing on all five continents. And finally, plant and animal populations are shifting and migration patterns are changing as species try to adapt to changing climates. Some species that are unable to adapt successfully have begun to decline. More severe weather events, such as droughts and flooding, are also a consequence of global warming, and a warning that action must be taken to preserve the environment now.” (From “The Sierra Club Global Warming Campaign” in J. Buckley, ed., The Harbrace Reader for Canadians, p. 273) From what perspective does the passage discuss global warming?
A、First-person narrator
B、Second-person narrator
C、Third-personal narrator
D、None of the above
| 阅读理解。 | ||||||||||||||||||||||||||
The contemporary environmental movement is often said to have begun with the publication ofSilent Springby the zoologist and biologist Rachel Carson (1907－1964). This landmark work, which took Carson 4 years to complete, diligently detailed the relationship between animal death and the use-now understood as the abuse of manmade chemicals used as pesticides, especially DDT. One of the claims of the book that she tried to demonstrate was that DDT had the effect of softening the eggshells of birds as well as interfering with their reproduction, and that such effects would lead to their extinction if the use of DDT were to continue. It would eventually create a springtime of silence when the songs of birds would not be heard. Her studies also found DDT to be a cause of human cancers. Born in Springdale, Pennsylvania, Carson graduated from the Pennsylvania College for Women in Pittsburgh (now Chatham College), where she majored in English until her junior year, when a course in biology inspired her to switch to zoology as her field of concentration. She earned a master’s degree in this area from Johns Hopkins University and became a biologist at the Bureau of Fisheries in 1936. During this time, she wrote for various national magazines, and her first book,UndertheSeaWind,was published. Carson had concerns as early as 1945 about pesticides being used more and more by the government. But her cautionary claims inSilentSpringwere met with anger by the pesticide and chemical industries. Her authority as a scientist was challenged, and it was held that her findings were just the roars of a hysterical(歇斯底里的) woman. She was even accused of being a member of the Communist Party. Some go so far as to say that she told a lie. But she is often celebrated as the founder of the contemporary U. S. environmental movement. Yet her work inSilentSpring,warning about the misuse of pesticides and other chemicals, has not as yet taken firm hold. Americans likely use twice as much the volume of pesticides that they did at the time she published her seminal work, and globally, their use is ever increasing. Powerful pesticides are sold over the counter, and their use is so widespread that many environmentalists are fearful that chemical runoff into streams and rivers is still polluting the animals that humans eat and the water that they drink. In short, while the main purpose ofSilentSpringwas to warn the public of the dangers of the overuse of pesticides and chemicals, nonetheless the public haven't refused such use. Isn't it time that we firmly said no to pesticides？
|
A. Service
B. Business
C. Customer service
D. Making money
一级反应A→B+C，已知A的起始浓度为0.50mol·dm-3，速率常数k=5.3×10-3s-1，试求：这个反应的速率
零级反应A→B+C，已知A的起始浓度为0.36mol·dm-3，完全分解用了1.0h，试求该反应以s-1为单位表示的速率常数。
某反应A→B，当反应物A的浓度c(A)=0.200mol·dm-3时，反应速率为0.005mol·dm-3·s-1。试计算在下列情况下，反应速率常数各为多少？
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
微信搜一搜
简答题
微信搜一搜
简答题
如搜索结果不匹配，请 
