设数列{an}的前n项和为Sn,(对于所有n≥1),且a4=54,则a1的数值为()

题型:单项选择题

问题:

设数列{an}的前n项和为Sn(对于所有n≥1),且a4=54,则a1的数值为()。

A.2

B.4

C.6

D.8

考点:在职联考GCT(数学)数学
题型:单项选择题

叶某,男,38岁。近半年来常于劳累或精神紧张后感头痛、头晕,休息后好转,未予治疗。最近体检发现血压升高,三次不同时间测血压分别为140/90mmHg、150/95mmHg、155/95mmHg。对其诊断与处理最重要的考虑应为()

A.继续在不同时间内测血压,以帮助确诊

B.注意休息,缓解精神紧张

C.试用利尿剂治疗,观察其用药反应

D.确定是原发还是继发性高血压

E.暂不处理,3个月后复查血压

题型:单项选择题

Everyone knows about straight—A students. We see them frequently in TV situation comedies and in movies like Revenge of the Nerds(《菜鸟大反攻》),a comedy film satirizing(讽刺)social life in college. They get high grades,all right,but only by becoming dull laborers,their noses always stuck in a book. They are not good at social communication and look clumsy while doing sports.

How,then, do we account for Domenica Roman or Paul Melendres?

Roman is on the tennis team at Fairmont Senior High School. She also sings in the school singing group, serves on the students’ union and is a member of the mathematics society. For two years she has kept up A’s in every subject. Melendres, a freshman at the University of New Mexico,was student-body president at Valley High School in Albuquerque. He played soccer and basketball well, exhibited at the science fair,and meanwhile worked as a reporter on a local television station. Being a speech giver at the graduation ceremony,he achieved straight A’s in his regular classes,plus rewarding points for A’s in two college-level course.

How do super—achievers like Roman and Melendres do it? Brains aren’t the only answer “Top grades don’t always go to the brightest students,” declares Herbert Walberg, a professor of education at the University of Illinois at Chicago, who has conducted major studies on super—achieving students “Knowing how to make the most of your innate(天生的)abilities counts far more. Much more.”

In fact,Walberg says,students with high IQ sometimes don’t do as well as classmates with lower IQ. For them,learning comes too easily and they never find out how to get down.

Hard work isn’t the whole story, either.“it’s not how long you sit there with the books open.”said one of the many—A students we interviewed. “It’s what you do while you’re sitting.” Indeed,some of these students actually put in fewer hours of homework time than their lower-scoring classmates. The kids at the top of the class get there by mastering a few basic techniques that others can readily learn.

小题1:What can we conclude from the first paragraph?

A.Most TV programs and films are about straight-A students

B.People have unfavorable impression on straight—A students

C.Everyone knows about straight-A students from TV or films

D.Straight-A students are well admired by people in the society小题2:What will be talked about after the last paragraph?

A.The interviews with more students

B.The role IQ plays in learning well

C.The techniques to be better learners

D.The achievements top students make小题3:What can we infer from the passage?

A.IQ is more important than hard work in study

B.The brightest students can never get low glades

C.Top students certainly achieve all-around developments

D.Students with average IQ can become super-achievers

题型:单项选择题

关于直接涂片镜检的叙述,下列哪项是正确的()

A.适用于所有细菌感染疾病的初步检查

B.方法简便易行,但均不能快速鉴定细菌

C.只适用于形态和染色性上具有特征的病原菌

D.其结果必须结合临床表现方有诊断价值

E.以上都不是

题型:单项选择题

关于Ph’染色体,下列错误的是

A.Ph’染色体是指9号染色体长臂远端易位,即t(9;22)

B.阳性见于90%以上的慢性粒细胞白血病患者

C.Ph’染色体还可见于其他血液病,如急性淋巴细胞白细胞

D.Ph’染色体一般不用治疗即消失

E.Ph’染色体阳性慢性粒细胞白血病者预后较阴性者差

题型:单项选择题

传动齿轮是奇数时,则其首尾齿轮的转动方向()。

A.相反

B.相同

C.无关

D.不一定

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