A:x
B:1.5x
C:0.5x
D:0.2x
已知全集U={0,1,2,3,4,5},集合M={0,3,5},N={1,4,5},则集合M∪CUN= ( )
根据句意和提示写出单词,完成句子。Guilin is a very beautiful city in the s____ of China. How I want to go on a trip there!What’s the p____ of China? It’s about 1.4 billion. China has the most people in the world.Never forget your own country w____ you go in the future.C ____ with the past, our life today is much better. —I don’t know what to do w____ my computer. It doesn’t work well again!—Why not ask Mr Jiang for help? He is a computer engineer.After a terrible earthquake, food, water and ____ (帐篷) are needed most.For thousands of years, the Great Wall has been the ____ (骄傲)of all the Chinese people.You don’t like eating snacks and I don’t like eating snacks, ____ (也).The special boots can prevent astronauts from____ (漂浮) away into space.On the moon we could____ (容易)jump much higher than on the earth.Tian’anmen Square is the biggest square in the world and is often____ (fill)with tourists.Neil Armstrong got his student ____ (pilot) licence at the age of 16. Last year our school held the 12th School Art and Culture Festival and it was a big____ (success)Thomas Edison was one of the greatest____ (invent) in the world.He made up his mind to explore places that were____ (know) to humans today.
艾滋病(简称AIDS)是一种严重的传染病,它是由人类免疫缺陷病毒(简称HIV)引起的.感染了HIV的人称为艾滋病病毒感染者,当病毒将人体免疫力破坏到一定程度,就会成为艾滋病病人.艾滋病主要通过血液传播、性接触传播和母婴传播,日常接触不传播.