______ is an international news agency founded in______.

单项选择题The word bird used to mean young bird ; today it means any kind of bird . This is called ______ in terms of semantic change.

单项选择题Which of the following is NOT of British origin

单项选择题Generally speaking, the eastern American cities are (more) ______ than the western ones.

单项选择题One of the most promising methods of storing hydrogen fuel is ______.

单项选择题Which of the following is the characteristic of hydrogen