上海高三英语概要写作模拟练习.docxVIP

高三英语概要写作模拟练习 一．Directions: Read the following passage. Summarize the main idea and the main point(s) of the passage in no more than 60 words. Use your own words as far as possible. A Brief Introduction of Cryptocurrency In 2008, someone, or perhaps a group of people, using the name Satoshi Nakamoto published a paper to an online group that discussed cryptography (密码学). That paper described a process that would use cryptography to create a secure electronic cash system, now known as a cryptocurrency (加密货币). Person to person payments could be made online using a shared network of computers instead of a bank or other financial institutions. Each transaction could happen very quickly. The shared network of computers would also serve as the means to verify(核实) those transactions safely. Getting rid of the need for a centralized banking system would open up the possibility for anyone to become part of the digital economy. The software behind cryptocurrency is open source, which means anyone can use the original code to create their own version. Today, there are well over a thousand different cryptocurrencies. Unfortunately, their becoming the global payment systems are held back by problems affecting the entire cryptocurrency industry. One issue is weak security on cryptocurrency websites where users either store their electronic cash in virtual “wallets” or exchange one kind of electronic cash for another. In recent years, clever thieves have broken into many of these websites and stolen electronic cash. The websites are struggling to protect their users from such thefts. Another problem is the large number of fake cryptocurrencies that are advertised on the internet. The advertisements invite internet users to visit websites offering new cryptocurrencies. Many visitors are persuaded by the websites to buy their cryptocurrencies using actual money. Later, the websites disappear along with the victims’ money. In response to this problem, companies like Facebook and Google