The frequency 849MHz doesnt interfere with the planes GPS system because______.
A．it's out of the range of airline communications
B．it's like a moving Starbucks hot spot
C．it was sold to a Wi-Fi service provider
D．it's received by the antenna on top of a plane

未分类题It is indicated in Paragraph 1 and 2 that______.A．all airlines provide Wi-Fi Internet serviceB．aircraft-communications' frequency is higher than that of Wi-FiC．airlines provide Wi-Fi service selectivelyD．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.