制造简单，价格便宜，材料利用率高，对法兰密封面要求不高，具有多道密封作用，密封性能好的中压垫片的是（）垫片。

A、塑料

B、橡胶石棉板

C、透镜

D、石棉缠绕式

书面表达。

请你仔细阅读所给英文信，然后给Worried写一封回信。要求包含以下内容：

1．鼓励他振作，不要灰心。

2．记一些惯用词组和句型结构，将它们组织在一起并用其造句。

3．多读英语，告诉他通过大量阅读才能正确使用语言。

4．多背诵一些好的短文。

要求： 不要逐字逐条翻译，词数一百左右。

Dear Helpful,

    I’m a Senior Three student and I’m in trouble. I used to like English, but now I have some difficulty

with English, especially with English writing. Though I know English is a very important subject, I think

now it is too difficult for me. You know I have got poor results in English many times because my writing

is poor. I wonder why so many students like English and can get good results in English. I do want to

be one of the best students and go to a famous university after graduation. But my English is not good

enough. What should I do?

                                                                                                           Worried

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