透过胎盘预防胎儿缺氧性脑并发症的药物是（） A.咪达唑仑 B.丙泊酚 C.羟丁酸钠

Dear Mr Heppell,

I am Sabrina Akhtar studying in a high school and I’ve noticed that forests are disappearing (消失).

You know, forest are disappearing around the world each year. This is because of many different reasons including, farming, tourism pollution(旅游污染), etc, If we stop doing these things, there will be a good future for people of tomorrow.

Now I’m writing to ask you to help stop forests from disappearing. You can help by getting shops to stop selling paper made from trees and changing to tree-free paper (paper not made from trees). This will help forests so much . There are many , many things we can do to help forests. If you would like to know more, please visit http://www.Rainforestweb.Org/. By changing the little things, we can make a big difference.

If you would like to contact ( 联系 ) me, please see the above address or e-mail me at shazadinol @ hotmail.co.uk. Thank you for taking your time in reading this letter.

Yours sincerely

Sabrina Akhtar

小题1: The writer of this letter is ______.

A．a student

B．a teacher

C．an officer

D．a driver小题2: ______ is one of the reasons why the forests are disappearing.

A．Rain

B．Tourism pollution

C．Planting

D．Breathing小题3: The writer advises Mr. Heppell to _____.

A．stop shops from using paper any more

B．use paper which is made from tress

C．stop shops selling paper made from trees

D．plant more and more trees in the future小题4: How can Mr. Heppell contact the writer ?

A．By calling her

B．By interviewing her

C．By visiting her

D．By e-mailing her小题5: What’s the purpose (目的) of this letter ?

A．To know more about Mr. Heppell

B．To make friends with Mr. Heppell

C．To ask Mr. Heppell to teach in the school

D．To ask Mr. Heppell to help protect forests

2008年11月4日，大陆海协会会长陈云林与台湾海基会董事长江丙坤共同签署了《海峡两岸空运协议》、《海峡两岸海运协议》、《海峡两岸邮政协议》、《海峡两岸食品协议》。根据上述协议，两岸大体上基本完成“三通”（通邮、通航、通商）。这表明 [ ]

A．海峡两岸关系已经没有任何障碍，会迅速统一

B．解决祖国统一的基本方针“一国两制”具有巨大的生命力

C．我国实现完全统一大业，台湾回到祖国母亲的怀抱

D．实现祖国和平统一是海峡两岸人民的共同心愿

质量为m的汽车，启动后沿平直路面行驶，如果发动机的功率恒为P，且行驶过程中受到的摩擦阻力大小一定，汽车速度能够达到的最大值为υ，则阻力大小为______，当汽车的车速为υ/4时．汽车的瞬时加速度的大小为______．

从第一期起，在一定期间内每期期末收到或付出的等额资金称为( )。

A．永续年金

B．先付年金

C．后付年金

D．递延年金

[化学——选修3：物质结构与性质]（15分）周期表前四周期的元素a、b、c、d、e，原子序数依次增大。A的核外电子总数与其周期数相同，b的价电子层中的未成对电子有3个，c的最外层电子数为其内层电子数的3倍，d与c同族；e的最外层只有1个电子，但次外层有18个电子。回答下列问题：

这些元素形成的含氧酸中，分子的中心原子的价层电子对数为3的酸是 ；酸根呈三角锥结构的酸是 。（填化学式）