Unit3  Life in future

   for this reason, these boats are perfect toys for weekend use but not much more than that. it' s best to leave them in the sun during the week to let the battery charge and then use them on weekends. in other words, if you need to use a boat every day you may still need to use a gas-powered boat.
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
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.
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.
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.
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天的運河旅行，不過使這次旅行與眾不同的是他們的船主要依靠太陽能來驅使行進。
41. b。 推理判斷題。根據文章第二、三段以及最后一段的第二句可知，the loon的能量來源主要是依靠太陽能。當船運行的時候，太陽能板直接捕捉太陽能并把它轉化成電能，而當這種直接獲取的電能不夠使用的時候，它就使用電池里早已經蓄好的電能作為補充。而從最后一段的第二句可知，電池里的電也是在平常的時候把它放到外面吸收太陽能作為儲備的，由此可知b項正確。
42. c。 細節理解題。根據文章第四段的“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.”可知答案選擇c項。