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【单选题】
波长为589.3nm的照射在一双缝上,在距双缝100cm的观察屏上测量20个条纹共宽2.4cm,计算双缝之间的距离。A.
49.1um
B.
0.491mm
C.
25um
D.
2.5mm
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举一反三
【单选题】听力原文：W: I can't believe I have almost spent all $ 4,000 of my student loan. That money was supposed to last me all year. M: Maybe you should start living within your means, like you've been told time ...
A.
She Should find a job.
B.
She should just stop worrying.
C.
She should be more realistic with her money.
D.
She should ask for more money from the loan office.
【单选题】听力原文：M: I can't believe I have almost spent all $9,000 of my student loan．That money was supposed to last me all year． W: Maybe you should start thinking twice before you spend money, like you've been...
A.
Spend money more reasonably.
B.
Find a job to support his family.
C.
Apply for student loans again.
D.
Stop worrying about money.
【简答题】I spent almost all my spare time surfing the Internet. I'm absolutely a ( ) 网虫.A. mouse potato
【单选题】I (had spent) months (to build) my fiberglass boat, now that it was ready, I wanted (all my friends) to come and see (it).
A.
had spent
B.
to build
C.
all my friends
D.
it
【单选题】I spent almost all my spare time _______ the Internet .
A.
surf
B.
surfing
C.
surfed
D.
surfs
【简答题】I spent almost all my spare time surfing the Internet so I'm absolutely a mouse potato.
【单选题】下列关于生活常识叙述错误的是（ ）。
A.
营养不良、身体水肿应多吃蔬菜
B.
多吃苹果可以增强记忆
C.
感冒时吃海鱼容易引起过敏反应
D.
在饭菜中少放盐可以预防高血压
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