单项选择题
A.They were ironworkers.B.They were practiced farmers.C.They spoke Anglo-Saxon English.D.They drained much of the marshlands and built houses.
A.explain how cell phones workB.introduce three types of cell phonesC.discuss the fun of using mobile phonesD.describe the harm of water to cell phones
A.It can be submerged，frozen and washed.B.It can be submerged，washed，and run over by a sports car.C.It can be frozen，washed，and dropped from a second-story window.D.It can be submerged，frozen and dropped from a second-story window.