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课后达标检测19 Unit 4 Helping people around the world (建议用时：70分钟) Ⅰ.单项填空 1．(2017·高考湖北卷)Carbon dioxide，which makes a________between us and the sun，prevents heat from getting out of the atmosphere easily，so the earth is becoming warmer. A．difference B．comparison C．connection D．barrier 2．(2017·高考福建卷)Old－fashioned phones matter when wireless networks ________in disasters. A．turn down B．turn out C．break down D．break out 3．(2015·长沙模拟)It is not ________ to discuss the question again and again. A．worth B．worthy C．worthwhile D．while 4．We hurried all the way to the airport，only________that the flight had been called off because of the foggy weather. A．being told B．to be told C．having told D．to have been told 5．You have to be accurate in this job，because a small mistake can make a big ________. A．difference B．difficulty C．trouble D．change 6．Those who ________ new responsibilities need additional guidance for a period of time until they are familiar with the new work. | 
