42. C。　 细节理解题。根据文章第四段的“My boat is at least eight times more efficient than a gas-powered boat, which means that it saves me a lot of money and keeps the environment clean.”可知答案选择C项。

41. B。　 推理判断题。根据文章第二、三段以及最后一段的第二句可知，the Loon的能量来源主要是依靠太阳能。当船运行的时候，太阳能板直接捕捉太阳能并把它转化成电能，而当这种直接获取的电能不够使用的时候，它就使用电池里早已经蓄好的电能作为补充。而从最后一段的第二句可知，电池里的电也是在平常的时候把它放到外面吸收太阳能作为储备的，由此可知B项正确。

45. The passage mainly talks about ___________.

　　 A. the Gisbornes' 12-day trip to New York

　　 B. the first solar-powered boat across American canal system

　　 C. a new invention to replace gas-powered boats

D. the shortcomings of solar-powered boats for everyday use

答案：

Gisbornes一家完成了12天的运河旅行，不过使这次旅行与众不同的是他们的船主要依靠太阳能来驱使行进。

44. What can we infer about the solar-powered electric boats from the last paragraph?

　　 A. They can meet the needs of fishermen.

　　 B. They are not as good as gas-powered boats for Sunday boat rides.

　　 C. They are suitable for going out on a lake with the family on Sundays.

　　 D. People who like toys should use them on weekends.

43. What is the shortcoming of the solar-powered boat?

　　 A. It is not very good for everyday use.

　　 B. It is not environmentally friendly.

　　 C. It is not as fast as gas-powered boats.

　　 D. It is too slow for people who use boats a lot.

42. What does Gusborne think is the best part of his boat?

　　 A. It is almost as fast as other boats.

　 　B. It only needs to use energy from water.

　　 C. It uses energy more efficiently.

　　 D. Its battery charges quickly.

41. From the passage, we can learn that ______________.

　　 A. the Loon was the first solar-powered boat to set sail in America

　　 B. the Loon gets all its electricity from the sun via solar panels

　　 C. Tamarack Lake Electric Boat Company designed the first solar-powered boat

　　 D. Gisborne first designed the solar panels for the boat

40．which引导定语从句，先行词是atlas；先行词是物，在直接在介词后只能用which。

39．an因表示“在……的高度”是at an altitude of…。