选不同
①____A.cleaned B.talked C.washed
②____A.saw B.watched C.slept
③____A.yesterday B.morning C.today
④____A.clothes B.bookstore C.hotel
⑤____A.magazine B.book C.film
证明定理:等腰三角形的两个底角相等.(画出图形、写出已知、求证并证明)
下列函数中自变量取值范围选取错误的是( )