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【简答题】
善于归纳和总结的发现，“结合”是初中数学的基本思想方法，被广泛地应用在数学学习和解决问题中，用数量关系描述图形性质和用图形描述数量关系，往往会有新的发现，在研究垂直于直径的弦的性质过程中（如图，直径AB⊥弦CD于E），设AE=x，BE=y，他用含x，y的式子表示图中的弦CD的长度，通过比较运动的弦CD和与之垂直的直径AB的大小关系，发现了一个关于正数x，y的不等式，你也能发现这个不等式吗？写出你发现的不等式（ ）。
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A.
medicine
B.
monitor
C.
mention
D.
marathon
【简答题】Room temperature must be ______ ℃.
【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
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A.
should be
B.
must be
C.
must have been
D.
should have been
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A.
Chen Lu isn't a reporter
B.
Chen Lu isn't a teacher
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