Language reflects sexism in society. Language itself is not sexist， just as it is not obscene; but it can connote sexist attitudes as well as attitudes about social taboos or racism.

The division of English into Old English， Middle English， and Modern English is nonconventional and not arbitrary. 点击查看答案&解析

An important difference between presupposition and entailment is that presupposition，unlike entailment，is not vulnerable to negation. That is to say, if a sentence is negated, the original presupposition is still true. 点击查看答案&解析