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【单选题】
对电力系统的基本要求是A.
保证对用户的供电可靠性和电能质量，提高电力系统运行的经济性，减少对环境的不良影响
B.
保证对用户的供电可靠性和电能质量
C.
保证对用户的供电可靠性，提高系统运行的经济性
D.
保证对用户的供电可靠性
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举一反三
【单选题】He __ go to bed late.But now he __ going to bed early and getting up early. [ ]
A.
was used to, used to
B.
used to, is used to
C.
is used to, use to
D.
use to, was used to
【单选题】He says '_____' to his parents before he goes to bed. [ ]
A.
Good evening
B.
Goodbye
C.
Going to bed
D.
Good night
【简答题】He ______(go) to bed. he went to bed a little earlier than usual.
【简答题】A．He went to work. B．He closed the door. C．He went to bed again. D．He didn't go to bed until the next morning.
【简答题】A．He went to work. B．He closed tile door. C．He went to bed again. D．He didn't go to bed until the next morning.
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