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【单选题】
放在桌面上质量为10 Kg的物体，如果受到一个竖直向上的78 的拉力，则下列说法正确的是A.
物体受到桌面的支持78N
B.
物体对桌面的压力为98N
C.
物体受到桌面的支持20N
D.
物体受到的合外力为20N
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【单选题】---Can't you see anything in the sky? ---______. I forgot to wear my glasses.
A.
Yes, I can't
B.
No, I can't
C.
Yes, I can
D.
No, I can
【简答题】根据所给的单词、汉语提示或首字母和英文释义写出正确的单词。 1. Look at the birds in the sky. Can you see ________ (they)? 2. He helped a boy________ (call) Daxiao in Sichuan all the time after the earthquake. 3. The supermarket is...
【单选题】听力原文：M: Oh, look at the sky, Cathy! It's starting to get cloudy. W: I see it. I hope it doesn't rain. I thought it was going to be a fine day today. M: That's certainly what the department was hoping ...
A.
They are planning a picnic for the department.
B.
They are having a picnic organized by the department.
C.
They are discussing how to escape from the sun.
D.
They are drinking and talking about the weather.
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