某排烟系统工作压力为450Pa，采用矩形排风管，下列那几项风管漏风量m3/m2.h值

由涉水产品带入饮用水中的有害物质无依据可确定容许限值时，需进行（）

A.流行病学调查

B.毒理学试验

C.浸泡试验

D.致畸试验

E.致癌试验

原发性肝癌的常用肿瘤标记物是（）

A.CEA

B.PSA

C.AFP

D.CA199

E.PSA

I often have chicken and fruit _____ dinner.[ ]

A. of        

B. for        

C. at      

D. in

第二节读写任务

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

【阅读材料】

I am a 19-year-old girl named Gina. When I was 17, I gave blood for the first time. It was a little scary because I don’t like needles and I am afraid of looking at my own blood.

The blood drive was in the high school gym. I determined to help because I had read the poster about how much one pint(品脱：计量单位) of blood could do for someone else.

After signing a form, I lay in the chair. When I waited for the nurse to get to me, one girl I didn’t know well noticed my nervousness and sat next to me, telling me what a good thing we were doing for someone else. It took a long time to get a pint. But somehow, I suddenly felt like an adult when my first blood donation was finished. I had overcome my fear in order to do something selfless that would benefit others.

Now ,I still donate blood. The Red Cross calls and invites me to blood drives, and I always try to go. It’s not scary any more. It’s something you do for others, without getting anything in return.

[写作内容]

国外的很多青少年都把献血视为步入成年的标志。请你在看完所写的短文后，就“献血的意义”这个主题写一篇短文，说说你对献血的看法，内容要点包括：

以约30个词概括短文的要点；

然后以约120个词写一篇短文，至少包括以下内容要点：

现在社会上人们对献血有哪些不同的看法；

你自己对于献血持什么样的态度，为什么；

你认为献血对于青少年思想成长的意义。

【写作要求】

可以利用实例或其他论述方法支持你的论点，也可以参照阅读材料的内容，但不得直接引用阅读材料中的句子。

某中学地理探究性学习小组对该中学与高速公路之间的一片林地与裸地气温进行连续监测，测得林地与裸地月均温差值变化如下表。据此完成下列小题。

该片林地的作用主要体现在（）

①涵养水源

②保持水土

③减弱噪声

④吸烟滞尘

⑤防风固沙

A.①②

B.②⑤

C.③④

D.③⑤