III. Cloze克漏字 (每題1分，共26分) A.   Before the Flood is a widely-viewed film which tries to raise people’s awareness of global warming. It has shown the audience how fast the pace of ice melting has been in the Arctic and how terrible the results would be 23._____ humans continue to pollute our earth. As the ice sheet has melted quickly in the past few decades, it has mostly24._______ rising temperatures with carbon dioxide 25._____ the sun’s heat. The burning of fuels26._____in producing such huge amounts of CO2.Thus,27._____ polar bears in the Arctic is decreasing since they failed to catch enough food and 28._____ hunger. Furthermore, humans are also the victims of global warming mainly in two ways. The rising sea levels indicated thatcoastal areas and big citiesmight be underwater soon. Residents in these places 29._____ have nowhere to live then. 30._____ threat is the severe climate change. 31._____, more deadly disasters, such hurricanes or heat wave, have left lots of people homeless. More and more land that32._____ be fertile has become barren, 33.______ a lack of food. To sum up, 34._____ global warming seems to many people, it’s time for us to take immediate action to fight it.
【題組】23.
(A)if
(B) whether
(C) unless
(D) except