题目列表(包括答案和解析)
| A.3mg·mL-1 | B.6 mg·mL-1 | C.9 mg·mL-1 | D.4.5 mg·mL-1 |
阅读与回答问题
Is it possible to send messages to someone anywhere in the world without putting a stamp on it?It's easy to do so.Using computers you can send e-mail quickly and easily.If you have an e-mail address, you can write, send and receive messages.
E-mail is the most inexpensive way to communicate.You can send messages at any time of day of night to people all over the world without paying for a long-distance call.Many companies use e-mail for people in their offices or in other offices to communicate with one another.You can send the same message to fifty people or more.(It doesn't matter if your friends are in bed when you send e-mail to them, or you are seeing a film at the cinema when they send e-mail back)Many schools and universities give e-mail address to their students.E-mail address are becoming as common as phone numbers, but it can also make our lives more complicated(复杂).
1.What do you need to send and receive e-mail?
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2.Which is cheaper and faster to send messages, by e-mail or by post?
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3.When can e-mail be sent?
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4.Can you get any e-mails when you are out?
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5.Do you think it's helpful to use e-mail or not?Why?
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