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课时作业(八) [必修模块3 Unit 8 Adventure] [限时：30分钟] Ⅰ.单项填空 1．It was ________ great shock to the world that two airplanes crashed into ________ World Trade Centre in New York on Sept. 11. A．a；/ B．the；the C．a；the D．/；the 2．To keep healthy，Professor Johnson ________ cycling as a regular form of exercise after he retired. A．took up B．caught on C．carried out D．made for 3．They ________the train until it disappeared in the distance. A．saw B．watched C．noticed D．observed 4．The main cause of the disease in China is drug abuse, ________is very serious in Yunnan. A．what B．who C．that D．which 5．The data is limited in terms of both________and________. A．quality；quantity B．quality；quantities C．quantity；number D．quantity；numbers 6．The computer system ________suddenly while he was searching for information on the Internet. A．broke down B．broke out | 
