题目内容

Why does the author mention immigration and emigration in paragraph 8？

A. To identify factors affecting population dispersion
B. To give examples of territorial behavior. in animals
C. To show that populations balance themselves over time
D. To explain why animal populations are uniformly dispersed

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Look at the four squares,A ,B ,C , and D, which indicate where the following sentence could be added to the passage．Where would the sentence best fit？
The power of electronic technologies came from their ability to convey a sense of reality．
A The invention of electronic media changed communication more than any other technological event since the development of writing．B The spread of electronic media occurred with a speed never seen before, thus intensifying commercial and social interaction． There was a tremendous shift in how people received the information that contributed to their understanding of the world．C Voices or pictures could create ideas that appeared authentic—more so than ideas conveyed by the printed word．The graphic，intensely human nature of electronic media enhanced the belief that if it was on the air, it had to be true．D

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Look at the four squares,A ,B ,C , and D, which indicate where the following sentence could be added to the passage．Where would the sentence best fit？
He and his men then sailed south to Woodland, which could have been Newfoundland, Nova Scotia, or Maine, all of which are wooded．
Herjolfsson's account encouraged Leif Eriksson to undertake a southward voyage of exploration, starting around the year 1000．A In the course of his travels, Eriksson landed in a place he called Stoneland, which was probably the rocky, barren Labrador coast of North America．B Eriksson's party finally landed in Vinland, where they spent a winter in rough Viking huts in a seemingly frost-flee land of abundant vines and wild grapes．C They established the first European colony in North America at Vinland, the precise location of which remains a subject of scholarly dispute to this day．D The Norsemen returned home in the spring, abandoning the rude settlement that, a few years later, would serve as home base for Thorfinn Karisefni of Greenland．

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In paragraph 5, the author describes an experiment in which water is poured into various glasses in order to

A. show how children approach difficult problems
B. recommend an experiment that can be done at home
C. give a variation on a classic experiment by Piaget
D. suggest an activity for parents and children

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Which sentence below best expresses the essential information in the highlighted sentence

A. The Norse were the first Europeans to discover North America, but little evidence remains of their settlement at Vinland．
B. The location of Vinland, the first European colony in North America, was unknown until the twenty—first century．
C. The Europeans chose Vinland as the site of their first colony because it had perfect conditions for growing grapes．
D. Eriksson's Vinland was the first European colony in North America, but scholars still disagree over exactly where it was．

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Why does the author mention immigration and emigration in paragraph 8？

A. To identify factors affecting population dispersion B. To give examples of territorial behavior. in animals C. To show that populations balance themselves over time D. To explain why animal populations are uniformly dispersed

In paragraph 5, the author describes an experiment in which water is poured into various glasses in order to

Which sentence below best expresses the essential information in the highlighted sentence

A. To identify factors affecting population dispersion
B. To give examples of territorial behavior. in animals
C. To show that populations balance themselves over time
D. To explain why animal populations are uniformly dispersed