已知数据表A中每个元素距其最终位置不远，为节省时间，应采用的算法是______。 A

在一定温度下，下列叙述不能作为可逆反应A（g）+3B（g）⇌2C（g）达到平衡的标志的是（　　）

①C的生成速率是B的生成速率的

②单位时间生成a mol A，同时生成3a mol B 

③A、B、C的浓度不再变化   

④混合气体的总压强不再变化  

⑤混合气体的物质的量不再变化

⑥单位时间消耗 a mol A，同时生成3a mol B  

⑦A、B、C 的分子数目比为1：3：2．

A．②⑦

B．⑥④

C．①③

D．⑤⑥

在军事演习中，一门反坦克炮直接瞄准所要射击的静止的坦克模型，射击后经过1.2s，射手看到炮弹在坦克模型上爆炸，射击后经过4.2s才听到爆炸的声音．

（1）求坦克模型到射手的距离为多少米？

（2）炮弹运动的速度是多少？

（设炮弹做匀速直线运动，声音在空气中的传播速度取为340m/s）

简述交易磋商的步骤。

阅读理解。

     More Chinese are seeking out the surgeon's knife to improve their looks. Yet the tragic death of the

former Super Girl Wang Bei has made people aware of the risks of cosmetic surgery, which is becoming

increasingly popular.  Wang Bei,24,is said to have gone under the knife in Wuhan, to jump-start her

stage-show career. It seems that the ambitious singer has finally achieved the fame and influence after her

death.

    For years Miss Lu expected a plastic surgery to make her jaw fashionable narrow and her face smaller. She finally decided against it after hearing of the death of Wang Bei. "Wang Bei's death rang the warning

bell for me,"Miss Lu said in her blog." It was frightening and I gave up the plan. "

    A common thread of online discussion is why someone considered beautiful was so dissatisfied with

her looks. Some netizens said Wang was a victim of society's impractical standard of beauty:double

eyelids,and the pointed chin typical of Western actresses. Others said her death indicated the limits to

which people would go to achieve fame and fortune.

    Last year 15 billion yuan was spent on cosmetic surgery and the figure is expected to rise  20％

annually. The International Society of Plastic Surgery ranks China first in Asia in terms of the number of

cosmetic surgeries in 2009. Worldwide, China is third, after Brazil, while the United States is first.

    Nowadays,people are living longer and better. But the effect of aging off their appearance affects their

mood and confidence. Many older women want to look young and beautiful. Young people, on the other

hand, see cosmetic surgery as the key to wealth and love. "They want to improve their appearance to find better opportunities at work and in marriage," says a famous plastic surgeon. "We're living in a highly

competitive society. People regard appearance as a weapon in life battle. Those who are young and

naturally good-looking tell me,'I don't care how much I spend. Just make me look more beautiful.' "

    Advice from a surgeon and psychologist:

    1.Choose regular, qualified hospitals with a good reputation.

    2.Try to find an expert surgeon who will not suggest several operations over time.

    3.Don't expect too much from changing your appearance. Safety should be the first.

    4.Have a realistic understanding of the risks of the surgery (death,injury and failure)and make a balanced decision.

1. What's the influence of Wang Bei's death on the public?

A. People will feel alarmed at cosmetic surgery.

B. Young people will have no interest in beauty.

C. Doctors will be afraid to perform operations.

D. No one will dream of becoming a Super Girl.

2. It is mentioned in the passage that________. 

A. Miss Lu's face is narrow and small

B. Wang Bei is a victim of the Internet

C. all Westerners have the pointed chin

D. the US ranks first in cosmetic surgery

3. What's the main idea of the 5th paragraph?

A. People are living 1onger and better nowadays.

B. People are living in a highly competitive society.

C. Social competition leads females to seek beauty.

D. Cosmetic surgery is the key to wealth and love.

4. According to a surgeon and psychologist,it is better to________.

A. change your appearance sooner

B. make a reasonable decision

C. do several operations over time

D. try some different hospitals

患者，男性，75岁，反复咳嗽，咳白色泡沫样痰30年，每年3～4个月，5年来症状加重，活动后气促，2天来受凉后咳嗽、咳痰、胸闷、喘憋，体检：桶状胸，叩诊过清音，双肺下野可闻及干湿性啰音。心率120次／分，律齐，心浊音界不易叩出，心音遥远，双下肢凹陷性水肿

应进一步进行的检查不包括（）

A.心电图

B.血气分析

C.胸部X线

D.心肌酶谱检查

E.血常规和痰液检查