一束光从某介质射向真空，当入射角为θ时，折射光恰好消失，已知光在真空中的速度为C

只有一组对边平行的四边形叫做梯形．______．

阅读理解。

     I can’t remember a winter being as cold as this in Pennsylvania, but I’m sure there were colder days.

     Even though the daylight hours are growing longer minute by minute, it’s easy to find an excuse not to go out unless you absolutely must, but then again I often have to push myself to accomplish things.

     People I speak to have been in all kinds of nasty moods. They say they’re “under the weather,” not feeling good about this time of year.

     As I stood outside with my two dogs yesterday, it was so cold that my nose and face felt frozen and my ears were stinging.

     Of course, that doesn’t matter to Ricky and Lucy. They have a routine they must go through to find just the fighting spot no matter how cold or hot it is.

     So I wait.

     But this time it was different. As cold as it was, I suddenly was excited thinking about how wonderful this extreme cold really was.

     Then the sun broke through the clouds and memories of summer’s extremely hot days flashed through my mind. I could remember standing in the heat of the afternoon, with sweat pouring down my brow and the hot, burning sun against my face. I reminded myself then and there that in the cold of the winter I would wish I had this heat.

     I was grateful for the extremes. Without the extremes in my life, I would never appreciate the days when things were just right. Without the extremes, life would be boring.

     It’s being pushed to one of the extremes that makes us appreciate the middle more. Health challenges remind us that we need to pay more attention to how we live. Financial extremes remind us that when things go smoothly it’s also time to save for raining days.

     I’ve come to the conclusion that all too often I find a reason not to be happy with where I am at that moment.

     Whether it’s hot or cold, good health or bad, in the money or out of it, I always want it to be different.

     I’m tired of being “Under the Weather!”

1. What is the author’s attitude towards the extremes in life?

A. Grateful.

B. Critical.

C. Negative.

D. Unconcerned.

2. That day the writer waited in the terrible cold because ______.

A. his dogs wanted to hunt

B. he wanted to face the cold bravely

C. his dogs had a routine

D. he wanted to be different

3. The underlined word “nasty” (Paragraph 4) can be replaced by ______.

A. unpleasant

B. violent

C. favorable  

D. unusual

4. At last the author drew a conclusion that ______.

A. happiness cannot be gained by complaints

B. things will be different whatever the situation is

C. happiness will fail to come to you if you can find a reason

D. he is disappointed with his present situation

5. What is the best title for this passage?

A. Follow the Routine

B. Two Extremes in Life

C. Changes should be Expected

D. Weather Information

角色理论

闭经肾气亏损证的治法是（）

A.补肾益气，调理冲任

B.补肾疏肝，调理冲任

C.滋肾养阴，调理冲任

D.疏肝清热，活血调经

E.理气活血，祛瘀通经

在财务报表审汁中，注册会计师通常只关注两类舞弊行为即：侵占资产和编制虚假财务报告，丁注册会计师认为D公司下列情形中不属于编制虚假财务报告的是( )。

A．对编制财务报表所依据的会计记录或支持性文件进行操纵、弄虚作假(包括伪造)或篡改

B．向虚构的供应商支付款项

C．在财务报表中错误表达或故意漏记事项、交易或其他重要信息

D．故意地错误使用与金额、分类、列报或披露相关的会计原则