更多"To most scientists, sciences never "的相关试题:
[填空题]Most of the trash that Americans generate ends up in landfills.
[填空题]Science may never answer the most puzzling of all dinosaur questions. What killed these mighty creatures
One of the most popular theories about the death of the dinosaurs is that the world just grew too cold for them. Indeed, for large, coldblooded creatures, even a few nights of cold could spell death. How could the weather have changed Scientists think there might have been a cooling in the earth’s atmosphere during the Late Cretaceous Period.
16. ______
Not everyone agrees that a change in weather would have been enough to kill the dinosaurs. Some scientists say that dinosaurs might have been warm-blooded. Warm-blooded animals are able to make their own body heat. They can live in much colder climates than coldblooded animals.
17. ______
In the late 1970s, a naturalist named Walter Alvarez was studying the layer of rock that marks the end of the Age of Dinosaurs. He made a puzzling discovery. Alvarez found a layer of clay which contained a great
[单项选择]What impressed me most was that they never ______.
A. lost hearts
B. lost their hearts
C. lost heart
D. lost their heart
[单项选择]Most of the people who appear most often and most gloriously in the history books are great conquerors and generals and soldiers, whereas the people who really helped civilization forward are often never mentioned at all. We do not know who first set a broken leg, or launched a seaworthy boat, or calculated the (31) of the year, or manured a field; but we know (32) about the killers and destroyers. People think a great deal of them, so (33) so that on all the highest pillars in the great cities of the world you will find the figure of a conqueror or a general or a soldier. And I think most people believe that the greatest countries are (34) that have beaten in battle the greatest number of other countries and ruled over them as conquerors. It is just possible they are, (35) they are not the most civilized. Animals fight; so do savages; hence to be good at fighting is to be good in the way in (36) an animal or a savage is good, but i
A. fact
B. which
C. that
D. what
