单项选择题当债权人将债权让与第三人的事项通知债务人后，即使让与并未发生或该让与无效，债务人基于对让与通知的信赖而向第三人所为的履行仍然有效。
单项选择题The science fiction films can be said to offer an imaginary solution to the fundamental problem of how a prepared society might deal with the vulnerability of novelty or of an alien “other”. A、正确 B、错误
