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问题 选择题

“绿色化学”的核心内涵是“在反应过程中或化工生产中，尽量减少或消除使用有害物质”，下列情况符合绿色化学内涵的是（　　）

A．工厂烟囱冒出的黑烟

B．化工厂排出的污水

C．农村大量使用农药

D．造纸厂用O2或O3漂白纸浆

答案

答案：D

单项选择题

In 1987 sinusitis was the most common chronic medical condition in the United States, followed by arthritis and high blood pressure, in that order. The incidence rates for both arthritis and high blood pressure increase with age, but the incidence rate for sinusitis is the same for people of all ages. The average age of the United States population will increase between 1987 and 2000.
Which of the following conclusions can be most properly drawn about chronic medical conditions in the United States from the information given above

A．Sinusitis will be more common than either arthritis or high blood pressure in 2000.

B．Arthritis will be the most common chronic medical condition in 2000.

C．The average age of people suffering from sinusitis will increase between 1987 and 2000.

D．Fewer people will suffer from sinusitis in 2000 than suffered from it in 1987.

E．(E) A majority of the population will suffer from at least one of the medical conditions mentioned above by the year 20O0.
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选择题

反应A(g)+B(g)C(g) +D(g) 发生过程中的能量变化如图，△H表示反应的焓变。下列说法正确的是（   ）

A．反应体系中加入催化剂，反应速率增大，E1减小，E2增大

B．反应体系中加入催化剂，反应速率增大，△H不变

C．△H < 0，反应达到平衡时，升高温度，A的转化率增大

D．反应达到平衡时，加入A，再次平衡时A的转化率增大
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