证券公司自营业务违反《刑法》规定的行为不包括( )。 A．以自己为交易对象，进行不

一水硫酸四氨合铜（Ⅱ）的化学式为[Cu（NH₃）₄]SO₄•H₂O是一种重要的染料及农药中间体．某学习小组在实验室以氧化铜为主要原料合成该物质，设计的合成路线为：

相关信息如下以下电离（解离）过程：

[Cu（NH₃）₄]SO₄•H₂O=[Cu（NH₃）₄]²⁺+SO₄^2-+H₂O

[Cu（NH₃）₄]²⁺

Cu²⁺+4NH₃

②（NH₄）₂SO₄在水中可溶，在乙醇中难溶．

③[Cu（NH₃）₄]SO₄•H₂O在乙醇•水混合溶剂中的溶解度随乙醇体积分数的变化曲线示意图如下：

请根据以下信息回答下列问题：

（1）方案1的实验步骤为：

a．加热蒸发     b．冷却结晶      c．抽滤      d．洗涤       e．干燥

①步骤1的抽滤装置如下图所示，该装置中的错误之处是______；抽滤完毕或中途停止抽滤时，应先______，然后______．

②该方案存在明显缺陷，因为得到的产物晶体中往往含有______杂质，产生该杂质的原因是______．

（2）方案2的实验步骤为：

a．向溶液C加入适量______b．______c．洗涤，d．干燥

①请在上述内填写合适的试剂或操作名称．

②下列选项中，最适合作为步骤c的洗涤液是______．

A．乙醇      B．蒸馏水      C．乙醇和水的混合液     D．饱和硫酸钠溶液

③步骤d不宜采用加热干燥的方法，可能的原因是______．

阅读理解。

     Are you preparing for a big test? If so, you may want to play some basketball in between hitting

the books. Doctors are starting to find more and more information that suggests a connection between

exercise and brain development. Judy Cameron, a scientist at Oregon Health and Oregon Health and

Science University, studies brain development. According to her research, it seems that exercise can

make blood vessels(管), including those in the brain, stronger and more fully developed. Dr. Cameron

claims this allows people who exercise to concentrate better. As she says, "While we already know

that exercise is good for the heart, exercise can really cause physical changes in the brain."

     The effects of exercise on brain development can even be seen in babies. Babies who do activities

that require a lot of movement and physical activity show greater brain development than babies who

are less physically active. With babies, even a little movement can show big results. Margaret Barnes,

a pediatrician(儿科医生), believes in the importance of exercise. She thinks that many learning disabilities

that children have in elementary school or high school can be traced back to a lack of movement as

babies. "Babies need movement that stimulates their five senses. They need to establish a connection

between motion and memory. In this way, as they get older, children will begin to associate physical

activity with higher learning," says Margaret.

     Older people can beef up their brains as well. Scientists from 11 universities studied a group of

seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase

of up to 40 percent after exercising just three hours a week. The exercise does not have to be very

difficult, but it does have to increase the heart rate. Also, just like the motion for infants (婴儿), exercise

for older people should involve some complexity. Learning some new skills or motions, such as with

yoga or tai-chi, helps to open up memory paths in the brain that may not have been used for a long

time.

     For most people, any type of physical activity that increases the heart rate is helpful. The main goal

is to increase the brain's flow of blood. And your brain can benefit from as little as three hours of exercise

a week.

1. What is the best title of this passage?

A. How to exercise

B. How exercise helps the brain

C. How to get good scores on a test

D. How the brain can change

2. According to the reading, what is the connection between exercise and brain development?

A. Exercise makes us stupid.

B. The brain needs special mental exercise.

C. The more exercise, the bigger the brain.

D. Physical exercise helps us think better.

3. Why does the author think that yoga is fit for seniors?

A. It is easy to learn.

B. It can be done in groups.

C. It does not increase the heart rate.

D. It includes learning new motions.

MHC抗原可通过直接途径刺激T细胞。其他抗原可通过间接途径或同抗体结合激活免疫系统。（）

A.MHC抗原

B.mH抗原

C.ABO血型抗原

D.内皮糖蛋白

E.异种抗原

血清病最常见的皮肤损害为（）

A.丘疹

B.多形性红斑

C.脱屑

D.荨麻疹

E.皮下结节

一般垫木在刃脚的直线段应( )铺设，圆弧部分应径向铺设。

A．水平
B．平行
C．垂直
D．相间