Practice 4　　● You are the secretary of Mr. White and he has asked you to reply to the letter below apologizing to Mr. Right for the error he mentioned in the letter.
　　● Look at the information below, on which your boss has already made some handwritten notes.
　　● Then, using all your handwritten notes, write your letter.
　　● Write l20—140 words.

[判断题]DDoS攻击是指攻击者通过控制大量的僵尸主机，向目标网络发送大量精心构造的攻击报文，从而使被攻击者产生拒绝向正常用户的请求提供服务的效果。

[单选题]临床上固定矫治器一般间隔多久加力一次为宜（）

[单选题]使用电动捣固机时，接通电源后先使捣固机空转（）左右，经观察正常后方可使用。

[判断题]由于人类大规模的移动，在今天黄河流域通过考古发现了热带地区的生物、动物。

[单选题]通缉令发送范围，由签发通缉令的（）负责人决定。

[单选题]企业之间或者企业、事业单位之间联营，按照合同的约定各自独立经营的，关于责任承担，下列说法正确的是（　　）。

[单选题]为保护少年儿童的社会权利，l989年联合国大会通过了（　）。

[单选题]表单保存时会形成扩展名为（　）的文件

[单选题]腰椎前后位的中心线人射点是（）

[单选题]在信号转导中，能引起蛋白质构象变化的两类酶是（）

非专业可以考出版资格证书吗？有哪些报考条件？

关于BEC考试有哪些备考建议？

为什么要考BEC？

有哪些学习商务英语的好方法？

商务英语考试（BEC）难不难？

都说GRE考试难，那么它究竟难在哪？

什么是GRE考试？

雅思考试在即，如何快速备考？

说说雅思考试那些事

雅思5.5相当于CET几级的水平？

[问答题]Practice 4　　● You are the secretary of Mr. White and he has asked you to reply t...

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[单选题]What did U.S. Secretary of Agriculture do last week?

[单选题]Everybody（）in the hall where they were welcomed by the secretary.

[单选题]Who is Louise White?

[单选题]You look nice in white.（）

[单选题]You look nice in white.（）