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一件工程甲单独做15天可以完成，乙单独做12天可以完成，甲，乙，丙三人合作4天可以完成，那么丙单独做，( )天可以完成
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【简答题】According to the above TED talk, what are the usual motivation that people are driven to do things?
【单选题】In the last paragraph, Mr. Harris advises people to______.
A.
reduce the consumption of excess fats and sugars
B.
fully understand the drawback of technology
C.
watch out for the changes caused by technology
D.
let the next generation know what pre-Internet is
【简答题】Getting energy prices right is critical for sound policy-. But because of government energy subsidies, prices that consumers pay in many countries are often well below their real market value, l...
【简答题】Manners are important in England. Here is some a 小题1: if you are going to England. British people usually say “hello” or “nice to meet you”. When you are first i 小题2: to someone, shake their right han...
【判断题】This year, as usual, many people are leaving their homes to browse around the shops.
A.
正确
B.
错误
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