A Right B Wrong C Not mentioned
20.The new finding is based on a thorough study of 170,000 stars on the Milky Way.
A Right B Wrong C Not mentioned
21.The estimate of the number of planets that could support life is not very accurate.
A Right B Wrong C Not mentioned
22.This is the first research finding about the planets with a chance for life.
A Right B Wrong C Not mentioned
答案:CABABAC
第3部分概括大意与完成句子
Pathways to Research:Problem-solving
1 Pittsburghs many hills arent kind to bikers. Anyone hoping to pedal to work there has to contend with steep streets like Canton Avenue,which famously climabs at a nearly 40-degree angle.As a result,some residents avoid biking altogether.
2 But University of Pittsburgh graduate Micah Toll,23,and a few friends recently launched an invention that they hope will increase the citys pedal power. An electric bike called to Pulse PEVO. A super-strong battery powers the bicycle. Able to hit nearly 20 miles per hours without pedaling,it zips battery powers the bicycle. Able to hit nearly 20 miles per hour without pedating ,it zips up the citys most daunting(令人却步的)hills.Toll hopes it will persuade people in Pittsburgh and elsewhere to get out of their cars and onto bikes.
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