下列液体均处于25℃,有关叙述正确的是[ ] A.某物质的溶液pH c(CH3

题型:选择题

问题:

下列液体均处于25℃,有关叙述正确的是[ ]

A.某物质的溶液pH < 7,则该物质一定是酸或强酸弱碱盐

B.pH=4.5的番茄汁中c(H+)是pH=6.5的牛奶中c(H+)的100倍

C.AgCl在同浓度的CaCl2和NaCl溶液中的溶解度相同

D.pH=5.6的CH3COOH与CH3COONa混合溶液中,c(Na+) > c(CH3COO-)

考点:粒子浓度大小的比较溶液的酸碱性沉淀溶解平衡
题型:选择题

假定某一筛选计划检查了1000人,又假定某病的流行率为4%,而这种筛选试验的灵敏度为90%,特异度为80%.根据这些资料判断,被筛选出来的阳性者中真病人数是()。

A.40人

B.4人

C.36人

D.192人

E.768人

题型:选择题

Photographs are everywhere. They decorate (装饰) the walls of homes and are used in stores for sales of different goods. The news is filled with pictures of fires, floods, and special events. Photos record the beauties of nature. They can also bring things close that are far away. Through photos, people can see wild animals, cities in foreign lands, and even the stars in outer space. Photos also tell stories.

Reporting the news through photos is called photojournalism. At times photojournalists tell their stories through a single picture. At other times, they use a group of pictures to tell a story. Each picture is like a chapter in a book, which can do more than record the facts. It can also be a strong force for social change.

Jacob Riis was among the first photojournalists. He took pictures of parts of New York City where the poor lived. Riis believed that poverty(贫穷) caused crime, and he used photos to help him prove his point. A few years later, the photos of small children working in factories by Lewis Hine shocked the public. Hine’s pictures helped bring about laws to protect such children.

Hundreds of pictures may have to be taken in order to get one or two really good photos. It takes science to have the photo come out clearly and art to make a photo that has a good design and expresses feeling. Photojournalists make an actual record of what they see. A photo, however, can be both a work of art and an actual record. It can record an important event as a beautiful or exciting picture.

As historical and artistic documents(文献) ,photos can become more important over time. Today photojournalists still have their pictures appear in newspapers and magazines. They also publish(发表) them in books and on the Internet.

小题1:The underlined word “They” in the first paragraph refers to        .

A.beauties

B.photos

C.goods

D.events小题2:The photos of the small children by Hine show us that photos           .

A.are also works of art

B.are popular ways of reporting news

C.often shock the public

D.can serve as a force for social change小题3:What can we learn from the passage?

A.News with pictures is encouraging.

B.Photos help people improve

C.News photos mean history in a sense.

D.People prefer reading news with pictures.小题4:The text is mainly about      .

A.telling the story through picture

B.decorating the walls of homes

C.publishing historical papers

D.expressing feeling through pictures

题型:选择题

某医院儿科收治了一名高热患儿,经医生初诊"发热待查,脑炎可能"。急诊值班护士凭多年经验,对患儿仔细观察,发现精神越来越差,末梢循环不良,但患儿颈部不强直。于是,护士又详细询问家长,怀疑是中毒性菌痢。经肛门指诊大便化验,证实为菌痢,值班护士便及时报告医生,经医护密切配合抢救,患儿得救。

该护士的行为符合下列哪条道德要求()

A.举止端庄,言语文明

B.作风严谨,准确无误

C.平等待人,尊重病人

D.敬业负责,精益求精

E.关心病人,体贴入微

题型:选择题

土壤是岩石在风化作用下破碎,物理化学性质改变后形成结构疏松的风化壳.风化壳在气候与生物的作用下,经历很长时间形成的地表物质。与土壤自然形成过程无关的外来物质被称为土壤侵入体。 根据上述定义,下列属于土壤侵入体的是()。

A.考古发掘中挖出的砖瓦

B.岩缝中生长的野草

C.戈壁滩中大量的沙砾

D.河床上存在的大量鹅卵石

题型:选择题

以消积化瘀为主的饮片是()

A.醋大黄

B.酒大黄

C.熟大黄

D.大黄炭

E.清宁片

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