张小萌同学在进人中学后的第一次统考中各科成绩均不理想，于是他放弃了努力。这是[

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never ending flood of words. In (1) a job or advancing in one, the ability to read and comprehend (2) can mean the difference between success and failure. Yet the unfortunate fact is that most of us are (3) readers. Most of us develop poor reading (4) at an early age, and never get over them. The main deficiency (5) in the actual stuff of language itself—words. Taken individually, words have (6) meaning until they are strung together into phrases, sentences and paragraphs. (7) , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to (8) words or passages. Regression, the tendency to look back over (9) you have just read, is a common bad habit in reading. Another habit which (10) down the speed of reading is vocalization—sounding each word either orally or mentally as (11) reads.
To overcome these bad habits, some reading clinics use a device called an (12) , which moves a bar(or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate (13) the reader finds comfortable, in order to "stretch" him. The accelerator forces the reader to read fast, (14) word by word reading, regression and subvocalization practically impossible. At first (15) is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, (16) your comprehension will improve. Many people have found (17) reading skill drastically improved after some training. (18) Charlie Au, a business manager, for instance. His reading rate was a reasonably good 172words a minute (19) the training; now it is an excellent 1,378 words a minute. He is delighted that how he can (20) a lot more reading material in a short period of time.

A．training
B．habits
C．situations
D．custom

如图所示，AB是一质量为m的均匀细直杆，A端靠在光滑的竖直墙壁上，B端置于水平地面上，杆身与竖直方向夹角为θ，杆与地面的摩擦系数为μ，保持平衡，则此时杆与地面的摩擦力为（　　） A．mgtgθ B．mgsinθ C．μmg D．μmg

金黄色葡萄球菌引起的急慢性骨髓炎最佳选用

A．阿莫西林
B．红霉素
C．克林霉素
D．头孢曲松
E．乙酰螺旋霉素

根据《UCP500》的解释，信用证的第一付款人是( )。

A．进口人

B．开证行

C．议付行

D．通知行

在考生文件夹中有“student.mdb”数据库。
(1)按照下列要求建立“student”表。

字段名称	字段类型	字段大小	是否主键	默认值	有效性规则
学生ID	自动编号	长整型	是
学生姓名	文本	5
性别	文本	1		男	男or女
年龄	数组	整型		21	＞20

　　(2)设置年龄字段有效值＞20，否则提示“错误，请输入大于20的值”。
　　(3)在student表中输入如下数据。

学生ID	学生姓名	性别	年龄
1	刘天	男	22
2	孙佳	女	23
3	宋梅	女	22

student表如图所示。