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- 3My brothers were wathering some flowers at this time yestday. 怎么改
- 4There is a lot of ______(information)on the Internet
- 5I'm only able to have a "dog-helper" because of your kind donation!
- 6"得"dei怎么组词
- 7已知在△ABC中,三边长a,b,c满足等式a2+2b2+c2-2ab-2bc=0,试判断该三角形是什么三角形,并加以证明.
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