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【简答题】
长波与短波是以波长与障碍物的线度相比较而言的,对同一障碍物, 的衍射现象明显,方向性不好; 的衍射现象不明显,方向性好。(请填写 “ 长波 ” 或 “ 短波 ” )
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【单选题】The reporter didn’t ___________ /’men??n / more details about the accident.
A.
medicine
B.
monitor
C.
mention
D.
marathon
【简答题】Room temperature must be ______ ℃.
【简答题】在PLC的栈操作中,有进栈指令_______,出栈指令_______。
【单选题】Julia must ______ now, because the light of her room is turned off.
A.
sleep
B.
sleeping
C.
be sleeping
【单选题】The room ___________. It’s a real mess.
A.
must be cleaned up
B.
must cleaned up
C.
must clean up
【简答题】Host and reporter, the ( ) reads news stories, introduces reports by others and may interview news sources live.
【单选题】My sister _____ want to be a reporter _____ it's kind of dangerous. [ ]
A.
doesn't, but
B.
don't, and
C.
doesn't, because
D.
can't, so
【单选题】Why is so silent in the room? He _________asleep in the room.
A.
should be
B.
must be
C.
must have been
D.
should have been
【单选题】If Chen Lu weren't a reporter, she'd be a teacher.
A.
Chen Lu isn't a reporter
B.
Chen Lu isn't a teacher
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