问题 单项选择题

距梁中心2.45m以外道砟桥面人行道上的竖向静活载,在任何情况下不得超过()。

A、2kPa

B、4kPa

C、8kPa

D、10kPa

答案

参考答案:B

阅读理解

There was once a young mouse that lived in a hole in a wall. One day, the young mouse woke up from his sleep and looked out of the hole. As he looked out, a fantastic smell came to his nose. “Cheese!” the mouse said happily to himself. “I’ll go and get it now and have it for breakfast.”

But then he remembered his parents’ words. His parents were very clever mice and often said to their son, “Always wait before you go for a piece of cheese.”

So the young mouse waited quietly. Then he heard a quiet “Miaow” and he knew the cat was there. He stayed in the hole and said to himself, “I’m glad I listened to my parents and learned to wait.”

The next day, he looked out again. He put his nose out of the hole, and the beautiful smell of cheese came to his nose again. He could see the cheese. It was only a few centimetres away. But he sat still and waited quietly. This time he did not hear any cat’s noise. Instead he heard a very quiet “Woof, woof.”

“It’s a dog!” he thought. “If the dog is there, the cat won’t be there. I expect the dog has chased the cat away, so I’m safe.” The mouse ran out of the hole and started eating the cheese. He did not see the cat, which caught him and ate him.

When the cat finished her meal, she said to herself, “I’m glad I listened to my parents and learned a second language.”

小题1:Who told the mouse to wait before going for a piece of cheese?

A.The cat. 

B.The dog. 

C.The cat’s parents.

D.The mouse’s parents.小题2: How did the young mouse know the cat was there?

A.He heard the cat.

B.He saw the cat.

C.He smelt the cat.

D.He knew the cat.小题3:What was the cat’s meal?

A.The mouse’s parents.

B.The cheese.

C.The young mouse.

D.The fish.小题4:Which language did the cat learn as a second language?

A.English.

B.Chinese.

C.Dog language.

D.Mouse language.小题5:Which of the following sentences is Not True according to the passage?

A.The young mouse lived in a hole in a wall.

B.The next day the mouse didn’t hear any cat’s noise.

C.The cat pretended to be a dog by making the noise “woof”.

D.The mouse’s parents told their daughter to wait before going for a piece of cheese.

单项选择题

阅读下面一段文字,完成下列问题。

①生物体都具有感觉器官,无论是感知物理信息抑或检测化学信息的这些自然感测器,都是生物体藉以获得生存必需信息的良好帮手。然而人要获得客观世界的大量信息,光凭人类自身的感觉器官是远远满足不了的,必须借助人造的各类感测器。

②科学家们首先想到的是存在于生物体内的2000多种不同的酶。由于在人体生命活动中担任催化剂作用的酶具有严密的对象选择性,即某一种酶只促成对应的某种对象的化学反应,科学家们就巧妙地设计出各种带不同酶的生物类化学感测器。为了克服酶会溶于水而不能反复使用的技术难题,他们又将酶涂布在高分子膜上,然后将这种带酶的膜放进所测试的采样中,催化受质(待测的特定化学物质)的化学反应。在膜附近产生或消耗的其他化学物质,通过膜上带有的碳电极测定化学物质的浓度变化,就能间接地计算出原受质的浓度。这样,只要使用不同的酶,便可制成测定各种不同化学物质的生物感测器了。

③这种生物感测器是高技术的结晶。它利用了先进的印刷和半导体加工技术。先在基板上印刷碳电极,再印刷附着特定酶的膜,之后裹上多孔的高分子膜,类似集成电路的制作。一般是在同一基片上制成大量感测元件,只要将它们切开,就能同时制成多枚生物感测器。

④如今科学家已不满足于上述利用物质电特性制成的生物感测器,他们又投入以物质的光特性为基础的光纤传感类的新型生物感测器的研制,并将其广泛应用于各个领域。

第三段的“这种生物感测器”指什么正确的一项是()。

A.科学家根据酶具有催化作用的特点,通过联想而制造的带不同酶的感测器。

B.科学家根据生命活动中担任催化剂作用的酶具有严密的对象选择性而设计的人造感测器。

C.科学家利用先进的印刷和半导体加工技术,设计制造的人造感测器。

D.科学家将酶涂布在高分子膜上,然后进行催化受质的化学反应而制造出来的感测器。