题目内容：

Your friend Alice wrote you an email. Read the email and write at least 55 words to reply. （你的朋友Alice写了一封电子邮件给你。阅读这封电子邮件，写一封不少于55词的回信给她。）

Dear friend:

I’m conducting a survey on “The most useful invention”. It would be great if you can write a passage on this topic. You need to tell me the following information:

1. What’s the most useful invention in your opinion?

2. Why do you think it is useful?

3. What will happen if we live without it?

Hope to hear from you soon.

Yours sincerely

Alice

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