试题与答案

生产中使用的普通淀粉酶的最适温度在40℃—60℃之间,而极端耐热淀粉酶在100℃

题型:实验题

题目:

生产中使用的普通淀粉酶的最适温度在40℃—60℃之间,而极端耐热淀粉酶在100℃仍能保持较高的活性,因此具有更为广泛的应用前景。某同学正在设计一个实验以探究温度对两种淀粉酶活性的影响,其中有些问题需要你的帮助。

(1)此实验中除自变量和因变量外,还需要考虑________、________及________等因素。

(2)在此实验中,因变量可以用碘液和斐林试剂检测,两种试剂各与何种物质反应生色?检测的是底物还是产物?__________,___________。

(3)假设实验结果如上表,请在给出的坐标纸上绘图反映实验结果。

答案:

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题型:阅读理解

At one time no one could travel on an English road faster than four miles an hour. That was the law until 1896. A man had to walk in front of a car which could not go faster than the man. At night the man had to carry a red lamp.

Once Charles Rolls brought a car from France to England, but he wanted to drive faster than four miles an hour .In order to have no trouble with the police, he had a talk with some of the police officers, who ordered their policemen to look the other way when the car came along the road. This was a good plan in the country, but not so easy to follow in the busy streets of London.

One night Rolls and some friends started from London on their journey to Cambridge. One of the men walked in front with the red lamp, but he walked as fast as he could. The police became very interested in walls and shop-fronts when they heard the car, and not one of them saw it.

They reached a hill; but what a waste of time it was to drive down the hill at four miles an hour! Rolls was getting ready to jump into the car; but then he noticed a policeman who was not looking the other way. The slow car reached him.

“Good evening,” said the policeman, looking at the car.

“Good evening,” said Rolls, holding the lamp.

“One of these horseless things,” said the policeman, looking at it with interest.

“Yes,” said Rolls, and waited.

“I’ve often wanted a ride in one; but of course policemen can’t buy things like that.” He turned and looked hopefully in Rolls’s face.

“Jump in,” said Rolls.

“Thanks,” said the policeman, and did so. “Now,” he said, sitting down, “you can let it go just as you like down this hill. There isn’t another policeman on this road for a mile and a half.”

60.The policemen were told “to look the other way” (the underlined part in Paragraph 2) so that        .

A.they could watch the car coming from the other direction

B.the car could go faster than four miles an hour

C.they could make sure no one was in the way

D.the car would not hit them on the road

61.In what way did the policemen carry out the order from their officers?

A.They greeted Rolls when the car came along.

B.They walked in front of the car with a red lamp.

C.They pretended to be attracted by something else.

D.They stood on duty every 1.5 miles along the road.

62.The policeman who said “Good evening” to Rolls wanted to       .

A.teach Rolls a lesson                                  B.take a free ride home

C.have a talk with Rolls                               D.have a car ride experience

63.After the policeman jumped into the car, Rolls       .

A.dared not drive the car faster than he was allowed to

B.could drive as fast as he wished within a certain distance

C.could drive on any road he liked for the rest of the journey

D.drove his car as fast as he could down the hill to Cambridge

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