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heasokey
2 năm trước
cho hình chóp S,ABCD có đáy là hình bình hành ABCD tâm O . gọi M,N,P lần lượt là trung điểm của BC, CD, SA . tìm giao tuyến của (MNP) với các mặt phẳng (SAB), (SAD), (SBC) , ( SCD )
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American made the first film over one hundred and twenty years ago. He film a horse which _______________running very fast. The early films were all about one minute long. They were black and white, of course, and there was ______________sound. The films were often funny and showed things like people falling ____________or running to catch a bus. A hundred years ago, business people opened the ______________cinemas. It was very cheap to watch a few films. Sometimes somebody ___________ a piano while people watched. Often these cinemas were very dirty and there were _____________ insects in the seats! In the 1930s they started to make films with sound. It was very exciting for people to _______________the actors speak for the first time. A few years later people made films _______________ colour. This was also very exciting. Today many of the new cinemas are very big and _____________ ten or fifteen films to watch on any evening. A lot of people also watch films on TV and many people buy DVDs so they can watch their favourite films __________ home. 0. A / an / one 1. Is / are / was 2. No / much / any 3. Above / over / by 4. Last / first / later 5. Played / play / playing 6. Never / sometimes / no 7. Hear / heard / hearing 8. On / in / for 9. Showed / show / showing 10. At / in / on

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