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Part ADirections: You will hear 10 short dialogues．For each dialogue, there is one question and four possible answers．Choose the correct answer ― A, B, C or D, and mark it in your test booklet．You wil...
With the improving of our living standard, nowadays ,almost everyone can afford a cell phone. Every cion has two sides. When we are enjoying the benefits that cell phones have brought us ,we are now faced many problems. To start with , mobiles phones have brought us many conveniences. With...
[单项选择题]How many countries has the second speaker hitchhiked through so far 关键词: countries speaker hitchhiked A.28 countries. B.38 countries C.40 countries. D.48 countries. 本题来源:2020年北京大学英语考试模拟卷 查看最佳答案和解析...
who are we to disagree? an inevitable problem arises when you have multiple hands trying to build just one lego harry potter set. but with a lot of practice, the three kids have come up with an ingenious solution that we think many will enjoy. “basically, when it came to building the...
Inventions allow many businesses to be successful because inventions develop new or better processes or products that offer a competitive advantage in the marketplace. To qualify for a utility patent, the invention must be novel, nonobvious, and have some usefulness. Novel means new and not known...
A.untilB.ifC.thoughD.since 免费查看参考答案及解析 题目: [中考英语下半年中考模拟] —Many cities in China are now offering teenage girls free HPV vaccines (疫苗). —___ great news!A.WhatB.What aC.HowD.How a 免费查看参考答案及解析 题目: [中考英语下半年中考模拟] —Boys and girls,...
harder to scale up a physical or chemical invention than it is a software based invention. Think of batteries. Lithium-ion batteries in portable devices and electric cars are based on a 30-year-old principle. How many smart phone batteries, today, will last a full day on a single charge?
一、 阅读理解(共26小题,满分32分,1-20每题1分,21-26每题2分)A How do we know the time? A clock, a watch or a mobile phone can help us. However,many years ago there were no clocks and knowing the time was not so easy. Over the centuries people have developed different ways ...
aIt was one of the greatest inventions. It is said that in the 3rd century a Chinese man wrote about how to make it. At first, it was used for making fireworks. At the end of the Tang dynasty, people began to use it in wars. 它是其中一个最巨大的发明。 据说在第3个世纪一个中国人...