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课时跟踪检测(四) Earthquakes Ⅰ.单项填空 1．(2017·安徽皖西四校二模)—Hi, Mum. I got promoted for my wonderful performance in my work. —________ A．Congratulations！ B．Best wishes. C．Good luck. D．Don't mention it. 2．The spacesuits can be adjusted so that the team can reproduce different levels of gravity as if they ________ in space. A．are B．has been C．were D．had been 3．(2017·宿州一模)The greenbelt, ________ finished, will be of great importance to the environment of this area. A．while B．unless C．even if D．once 4．Mr. Yang stressed in his report that it was the waste water from the chemical factory ________ polluted the underground water in this area. A．who B．that C．which D．where 5．(2017·潍坊一模)The air in Beijing those days was difficult for people ________. As a result, lots of people had to stay at home, especially the old. A．breathing B．being breathed C．to breathe D．to be breathed 6．(2017·海南洋浦中学模拟)—Mary's always ________ in reading and studying. | 
