20世纪初,随着电影业、石油开采加工业、飞机制造业的发展,城市面积、人口、汽车拥

题型:填空题

问题:

20世纪初,随着电影业、石油开采加工业、飞机制造业的发展,城市面积、人口、汽车拥有量急剧增加,空气污染日益严重。1952年,洛杉矶有近400名老人因光化学污染造成心肺衰竭而死亡。光化学烟雾形成的化学过程是:当汽车尾气产生的NO2在日光照射下分解成NO和O时,即开始光化学烟雾的循环,不断地产生O3。这个循环包括下 * * 个化学方程式,请补充化学方程式②。

(1)①NO2====NO+O  ②_______________________③O+O2====O3

(2)写出以上3个化学反应的总反应式___________________。

考点:二氧化氮一氧化氮
题型:填空题

Bill,a 13-year-old boy, thought he had grown up to be a man. But his parents told him, "You won't be a real man until you begin to think about helping others."

One moming, his parents gave him some money to buy some milk. Outside a shop he saw a homeless old~man who looked very sick. Bill went to him and asked. "what's wrong with you?"

The old man answered, "I'm hungry,I haven't had any food for two days".

“Let's go to the restaurant."

When they got there, Bill asked the waiter to bring out bread and coffee to the old man. The old man finished the meal quickly. Afier the waiter took away the plate and the cup, the old man said, "Sorry for giving you too much trouble. I'm fine now. I'Il never forget your kindness! You're a very good young man."

Bill was happy when he heard this. Just when he wanted to pay for the meal, the waiter came.To their surprise, Bill and the old man leamed that their food was free because it was the birthday of the boss, and they were the first customers that day.

小题1:How old was Bill?

A.Eleven.

B.Twelve.

C.Thirteen.

D.Fourteen.小题2:Bill's parents said when he thought of               

A.helping himself.

B.helping others

C.making money

D.being friendly小题3:How long haven't the old man had food?

A.Two days.

B.Two hours.

C.One day.

D.One hour.小题4:What did the old man think of Bill?

A.Kind and tall.

B.Kind and good

C.Happy and handsome

D.Happy and cool.小题5:The food in the restaurant is free because that day was          birthday.

A.Bill's

B.the old man's

C.the waiter's

D.the boss's

题型:填空题

骨折后影响眼外肌运动造成复视的是()

A.上颌骨骨折

B.下颌骨骨折

C.牙槽骨骨折

D.颧弓骨折

E.颧骨骨折

题型:填空题

Though ______, running does us a lot of good.    [      ]

A. tired    

B. tiring    

C. we are tired    

D. it gets tired 

题型:填空题

The old man lives ________,  so he often feels ________. [ ]

A. lonely, alone

B. alone, lone

C. alone, lonely

D. alone, lone

题型:填空题

女,25岁,发热伴下肢和腹部皮肤瘀斑5天,查体:双下肢和腹部皮肤有多处瘀斑,双侧颈部、腋窝和腹股沟可触及淋巴结肿大,活动无压痛,最大者为2×2.5厘米,胸骨压痛(+),腹软,肝肋下1.5厘米,脾肋下2厘米,化验:Hb78g/l,WBC18×109,分类可见原始和幼稚细胞PLT25×109,网织红细胞0.002。

该患者最可能的诊断是()。

A.急性淋巴细胞白血病

B.非霍奇金淋巴瘤

C.急性粒细胞白血病

D.霍奇金淋巴瘤

E.系统性红斑狼疮

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