设函数的定义域为集合,函数的定义域为集合. 求:(I)集合 (II). 答案:解:(1)由函数有意义,得:,…………1分 即,所以,……………………………………………………… 3分 由函数有意义,得:,…………………………… 4分 即 所以;……………………………………………………………………… 6分 (2)由(1)得,………………………………………………8分 所14.You may never be in an emergency situation (紧急状况).But if it happens,you should know how to get help.The telephone book in the United States has emergency numbers on the inside front cover.Look at the following table from the Boston telephone book.Notice that the numbers for the police and the fire department (部门) are the same.And it is an easy number to remember.If you are too unhappy or excited to remember any numbers at all,you can simply dial"0"for an operator (接线员) in any emergency.EMERGENCY NUMBERSFIRE POLICE DOCTORBOSTON 911 BOSTON 911 BOSTON 482-5252CAMBRIDGE 876-5800 CAMBRIDGE 846-1212 CAMBRIDGESOMERVILLE 023-1500 SOMERVILLE 645-1212 SOMERVILLE 025-4774Other Places Other Places Other Places Write in your number here Write in your number here Write in your number here★COAST GUARD 223-6978OR DIAL"0"(OPERATIOR) IN ANY EMERGENCYWE ARE ALWAYS THERE AND READY TO HELP!根据表格内容,选择最佳答案.61.If you see a fire in Cambridge,you should dialD.A.023-1500 B.846-1212 C.645-1212 D.876-580062.If you live in Boston and you need a doctor,you should dialB.A.911 B.482-5252 C.025-4774 D.223-697863.If you see a boat sinking,you should dialD.A.645-1212 B.023-1500 C.876-5800 D.223-697864.If you have to get to the hospital quickly,you should callB.A.the doctor B.an ambulance (救护车)C.the police D.the fire department65.If you dial"o",C will answer your call.A.the police B.the doctor C.the operator D.the fire department.