It is indicated in Paragraph 1 and 2 that______.
A．all airlines provide Wi-Fi Internet service
B．aircraft-communications' frequency is higher than that of Wi-Fi
C．airlines provide Wi-Fi service selectively
D．not all mobile phones' signal will interfere with navigation

未分类题The main idea of the text is that______.A．accents are unfortunately often used to reinforce preexisting linguistic stereotypesB．accents are used to identify the social background of a speakerC．accents are generally used to form. negative opinions of the speakerD．we must stop discriminating against people due to accent

未分类题According to the text, the process of linguistic prejudice is deeper than it seems becauseA．accents may be viewed as forms of social identityB．accents are key ways to indicate class and prosperityC．accents are typically most distinct among minority groupsD．there is really no one accent that should be thought of as superior

未分类题According to paragraph 1, the author believes that communication skills areA．doubtlessly significant.B．to some extent important.C．inferior to breathing skills.D．a concern of the left-brain age.

未分类题According to the text, prolonged deficit spending may result inA．increasing investment.B．declined consumption.C．prosperous economy.D．expanded export.

判断题公共政策制定和执行的目的是解决私人问题。()