What's the attitude of the author? ( )

(单选题)Airline-maintenance hest practice could ( ) oil industry (单选题)Some marvelous artists ( ) the beneficial effect for peop (单选题)( ) his help, I passed this exam in the end. (单选题)The teachers ceased chatting for a moment when the headmaste (单选题)You can send and retrieve ( ) many files you want to a me (单选题)The local area network also connects to a wide area network (单选题)Which of the following words can best describe this passage? (单选题)From Cartwright, how to prevent from more bad dreams? ( ) (单选题)According to the passage, most people dream during their sle (单选题)Which of the following statement is not true? ( )