2 Comprehension Check-|||-2.1 Focusing on the main ideas-|||-Complete the following passage with key information from the text.-|||-In his 2003 speech at Rice University`s Energy &Nanotechnology Conference, the late Nobel Laureate-|||-Richard Smalley highlight the __ 10 problems for the next 50 years.In his list, __-|||-__ sits at the top,and water comes next.Now,with the price of solar power going down,the dawn-|||-of a new energy __ is just around the corner.As a result, __ is going to be the-|||-greatest challenge for humanity.-|||-But the water problem is __ First,unlike coal and oil,water can not be __-|||-__ Second,water is __ with every other sector of society.Third,while water demands are-|||-growing,climate change is intensifying droughts and floods and water supplies are __-|||-There are solutions,such as building water-transfer aqueducts,hydroelectric dams,and desalination-|||-plants.But they may be incredibly __ It will __ for scientists to find affordable-|||-solutions to the water problem.Before that, everyone should do his or her bit to __ water.

2.1 Focusing on the main ideas Complete the following paragraph with key informa

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[单选题]Which of the following activities can be used to get the main idea of a pas

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[单选题]The main idea of this passage is ______.A． many animals die during hibernationB． hibernation protects animals during the wintertimeC． scientists feel puzzled about hibernationD． some bats hibernate and others do not

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