解析:选B。标题归纳题。B项能概括全文,含主旨关键词:播放、太空。故选B。
词义猜测题(二)
A
(2015·四川雅安中学模拟)
Pangaea
Scientists in the early 1900s put forward the continental drift theory(大陆漂移说).They said that a great number of years ago,the seven continents we know today were a single,giant continent.A scientist named Alfred Wegener named it Pangaea.The name Pangaea comes from the Greek phrase for “all Earth”.
The theory’s timeline went against popular belief that Earth was only a few thousand years old.People wanted to believe that God had created Earth rather than the forces of nature.Wegener argued in favor of the continental drift theory in 1920.
Pangaea was a Cshaped landform that was spread across the equator(赤道).The large body of water within the crescent(月牙形) was called the Tethys Sea.The vast ocean that flowed around the continent was called Panthalassa.
The area of Pangaea would have been very vast.Inland regions would have been extremely dry from a lack of water.Animals could migrate freely from the North to the South Poles.
It is believed that the breakup of Pangaea began about 180 million years ago.This happened in the Jurassic Period.Over many millions of years,it broke into the seven continents as we know them today.The first stage of the breakup began about 180 million years ago.This change started when a large fault line(断层线) split.Activity would have started through earthquakes and volcanic eruptions.A gap was created through Pangaea that stretched from the Tethys Ocean to the east.This took place between what is now North America and Africa.The first split created two smaller continents.The southern one is known as Gondwana and the northern one Laurasia.Then another breakup began about 150 to 140 million years ago.At this time,the minor continent of Gondwana broke into four continents.These became Africa,South America,India,and Australia.The final stage of the breakup was about 60 to 55 million years ago.North America broke free from Eurasia.This opened up the Norwegian Sea.
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