由最后一段第四句中 after the mid20th century可知,只有20世纪90年代符合文意。 结果一 题目 Inventions are useful creations of the human mind. All our minds work in almost the sameway, so it's not surprising that different people can have similar ideas at almost the same timeWhat is ...
It improved the speed and exactitude of calculation(计算). In the1950s, desktop computers were invented in the same country. They became smaller and could be put on the desk. Since then, they have Computer become very important in many fields of work and leisure. Before the1970s, the ...
Ch 15.The Great Depression (1929-1940) Ch 16.The US in World War ll... Ch 17.Post-War World (1946-1959) Ch 18.The Cold War (1950-1973) Ch 19.Protests, Activism and Civil... Ch 20.The 1970s (1969-1979) Ch 21.The Rise of Political Conservatism... ...
The Internet(2)___(invent)by the US government in the 1960s,for the army to use.In the 1970s,scientists and business people also wanted to use the Internet(3)___(send) and receive messages.For some years ,people could only send very simple texts.They could not send photos or documen...
Ch 15. The Great Depression (1929-1940) Ch 16. The US in World War ll... Ch 17. Post-War World (1946-1959) Ch 18. The Cold War (1950-1973) Ch 19. Protests, Activism and Civil... Ch 20. The 1970s (1969-1979) Ch 21. The Rise of Political Conservatism... Ch 22. Contempor...
The Internet has been around for many years, but it was the inventions of the World Wide Web that made it really (help) to people.Together, the Internet and the World Wide Web have changed the world.The Internet1. (invent) by the US government in the 1960s, for the army to use.In...
has helped millions of people deal with clinical depression since it first became available as a prescription medication in 1987. Fluoxetine's potential as a selective serotonin reuptake inhibitor was actually discovered in the 1970s, but the FDA didn't give the drug the go-ahead for an entire...
There are many inventions that have caused great changes in the world. Here is a short introduction of the maglev train(磁悬浮). The history of the maglev train started in the beginning of the 1900s. The American Robert Goddard and the French Emile Bachelet came up with the idea of frictio...
of documents of current registration indexed each year according to this classification of inventions reached 400,000 in 1971. This classification has been used in the USSR since 1970 as the state classification of inventions (the official name is the International Classification of Inventions). In ...
In the 1970s and 1980s, pro football's Dallas Cowboys team used it to line players' helmets to reduce the trauma of impact on the field. Shoe manufacturers have called on the foam to create special high-comfort insoles. In hospitals, mattress pads and wheelchair seats made from the foam ...