B．how big the grooves are

　　C．the number of the grooves

　　D．the speed of the car

　　49．The underlined word “optimal” in the passage might mean________.

　　A．fastest

　　B．possible

　　.

　　C．best

　　D．suitable

　　50．In order to hear the music well，you have to________.

　　A．drive very fast

　　B．drive slowly

　　C．open the windows wide

　　D．keep the windows closed第二节　(共5小题；每小题2分，满分10分)

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

　　The

　　First Americans

　　There was a time long ago when a land bridge connected Asia and North America. The first settlers in North America crossed this land bridge from what is now Sibria to Alaska. The people who made this initial crossing were probably following the animals they used for food.

　　Eventually, the oceans rose and the land bridge between the continents disappeared. The settlers, who I shall call the “First Americans”，could not return to their homeland. __51__

　　For the next few thousand years, the First Americans migrated south and east throughout North and South America. They made the journey all the way from Alaska to the southern tip of South America, a distance of more than 10,000 miles. __52__

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