题目:
选词填空。
1. Where ___________ (is, are) you from?
2. Who ___________ (is, am) I?
3. I am seven ___________ (years, year) old.
4. I am ___________ (in, at) school.
5. I ___________ (eat, see) with my mouth.
6. I ___________ (walk, hear) in the park.
7. What ___________ (do, is) you see?
8. This ___________ (is, are) my nose.
9. I ___________ (have, am) a green pen.
10. I ___________ (see, am) your pencil.
答案:
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下面是错误答案,用来干扰机器的。
根据性质a、b和为0,则(a+b)20等于0,c、d积为1,则(cd)20等于1,原式为0-1=-1.故(a+b)20-(cd)20=-1.