有下列语句，其执行的结果为______。 A．50 B．100 C．200 D．4

（6分）如图所示为实验室中常见的气体制备、净化、收集和性质实验的部分仪器。试根据题目要求，回答下列问题：

（1） 欲在实验室中制备并收集干燥的氧气。

① 所选仪器的连接顺序为            (填写仪器序号字母)。

②仪器A中，发生反应的化学方程式为                                。

（2） 欲用足量纯净的一氧化碳气体测定某不纯氧化铁样品的纯度 (杂质不反应)，并验证反应中气体生成物的性质。所选仪器的连接顺序为：纯净的一氧化碳气体 →D→B→C。

①仪器C的作用是                                       。

②仪器D中发生的化学反应方程式为                                         

③反应完全后，计算氧化铁样品的纯度时，小强同学认为“仪器D中减少的质量等于仪器B中增加的质量”。小丽同学通过称量发现二者质量并不相等。请你分析写出仪器D中减少的是           ________的质量，而仪器B中增加的是              _________的质量。

阅读理解。

     Scientists have argued for long over whether birds show real intelligence. Some scientists believe birds

have abilities(能力) including communication and different kinds of memory. In some unusual cases, their

abilities seem better than those of humans.

     Irene Pepperberg, a birds expert, did research about a grey parrot named. Griffin. Ms. Pepperberg says

Griffin can arrange objects in order of size. She says the talking bird also can combine words in the right

order. For example, he will combine words when asking for a piece of food. The researcher says experts

had thought that only humans and other mammals with large brains have the ability to combine objects and

words. She believes that bird brains have the ability to understand that complex(复杂的) tasks must be done

in the correct order.

     Some birds have other memory skills. For example, they collect and store thousands of seeds in autumn,

and find them later in winter. Alan Kamil and Alan Bond of the University of Nebraska are studying the

memories of birds called jays and nutcrackers. Their experiments show that these birds use natural objects to

find the seeds they have stored.

     It's said some birds can learn as many as 2,000 different songs. Songs may have developed as a way for

birds to communicate with other birds.

     According to Verner Bingman of Bowling Green State University in Ohio, birds must have a special

guidance system in their brain. He says that understanding how a bird's brain operates may help us better

understand how a human brain processes information.

     However, some scientists do still believe birds do many things that appear to be acts of thoughtful

intelligence. In most cases, they say, their behavior is simply instinctive (本能的), no reasoning power

directing it.

1. What is the main subject discussed in the passage?

A. The intelligence of birds.

B. Irene Pepperberg's study on birds.

C. The difference between humans and birds.

D. Ways for experts to train birds.

2. What's the main idea of Paragraphs 2-3?

A. Griffin, jays and nutcrackers are clever birds.

B. Objects help birds remember things.

C. Birds are as intelligent as humans.

D. Birds have certain memory skills.

3. It can be inferred from this passage that______.

A. most scientists believe birds have real intelligence

B. mammals understand the relationship between objects and words

C. maybe trees help jays to find the seeds they have stored

D. birds always communicate with one anther by singing

简述法的外部特征。

“克隆”、“转基因”等生命科学的重大突破

A．有力批判了“上帝造物”的观点

B．为“世界统一于物质”提供了自然科学依据

C．表明意识的能动性可以突破物质世界的规定

D．表明意识不仅反映世界而且创造世界

当混凝土结构施工质量不符合要求时，经（）检测鉴定达到设计要求的检验批，应予以验收。

A.设计单位

B.建设单位

C.监理单位

D.有资质的检测单位