已知集合,或. (1)若,求; (2)若,求实数取值范围. 答案:【详解】(1)当时,,, 所以; (2)因为,所以, 解得:. 【点睛】本题主要考查了集合之间的运算,需要掌握集合的交集、并集、补集之间的运算,属于基础题。5、How do you find your new classmates?
Most of them are kind, but ____ is
so good to me as Bruce.
A.
none B. no one C.
every one D. some one