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【单选题】
如图 a 所示,一光学平板玻璃 A 与待测工件 B 之间形成空气劈尖,用波长 λ =500 nm 的单色光垂直照射.看到的反射光的干涉条纹如图 b 所示.有些条纹弯曲部分的顶点恰好与其右边条纹的直线部分的相切.则工件的上表面缺陷是A.
不平处为凸起纹，最大高度为 500 nm
B.
不平处为凸起纹，最大高度为 250 nm
C.
不平处为凹槽，最大深度为 500 nm
D.
不平处为凹槽，最大深度为 250 nm
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举一反三
【单选题】I think you ought to end it ____ it is too late, or you’ll kill yourself.
A.
even if
B.
before
C.
so that
D.
once
【简答题】“ You'll kill yourself with those things," Arty said in a tone in which disappointment was __________ disgust.
【单选题】听力原文：W: Don' t make a sound or I' ll kill you. Now hand over your pocketbook. Make it fast! M: Here. Take what you want, Just don' t hurt me. Q: What's going on? (19)
A.
The woman is making a withdrawal from a bank.
B.
The woman is admitting the man to a hospital.
C.
The woman is robbing the man.
D.
The woman is ordering the man to stop.
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