保证事务的原子性是数据库管理系统中哪一个部件的责任A) 事务管理 B) 存取管理 C

Though hardly as unwelcome as death or taxes, college entrance exams are just as inevitable and almost as dreaded by high school students.
As the testing dates loom for juniors and seniors for the SAT (formerly called the Scholastic Assessment Test) and the American College Test, or ACT, most students are looking for an edge, any edge, in the competition.
And as the number of homes with computers continues to rise, test publishers and software developers have been quick to recognize a growing niche. With the market for test preparation materials at all levels estimated at $540 million annually, they have jumped on the tech bandwagon to produce computerized tutorials that promise to boost scores.
(41) " We believe that it’s important for a student to be prepared to take the tests, " notes Don Powers, a research scientist at the Educational Testing Service in Princeton, N. J. , the organization that administers the SAT for the College Board. " It’s important to know how to take the test so that you won’t get a score that’s lower than you deserve. " But, he adds, " none of the rigorous scientific evidence that we have seen supports these promises" to raise test scores.
(42)Several points, however, do weigh in favor of software as opposed to traditional test-preparation. Cost is a big one.
(43)Convenience is another, as the College Board points out in touting its new sofware.
A few points to remember when evaluating various test-prep software packages:
(44)The exams, though they may seem mystical to the test taker, are not magic and certainly not random. There is little variation in the strategies the programs use to boost test scores because there is little variation in how the test are developed.
Largely, what differentiates one program from another is the computer interface, which can make the software more—or less—user-friendly, and such features as automated tracking of student progress.
(45)A crash course with test prep software is never an alternative to careful, long-term preparation for taking the exams. Some students are better equipped to respond to the self-paced, self-motivated approach software offers than others, Powers notes.
Although parents may be in the market for what they consider " serious " study aids, their children, who are the ones taking the tests, may appreciate the programs that offer a little humor.
Finally, as programs frequently point out, the SAT and ACT, while important to college admissions officers, are only one element of a successful college application.
[A] A test prep course with a live instructor can cost as much as $700. Test-prep software costs $30 to $80.
[B] Most of the programs, in fact, emphasize the importance of " guessing strategies " and eliminating unlikely answers to improve scores. Many students often succeed in exams in this way.
[C] Unlike many programs, this one can give you a quick, easy and comfortable way to achieve a high score. Such programs can turn your dream passing exams into reality.
[D] " I would rather use the program than take a preparation course, because I could do this on my own time and in my own home, " notes one student in the College Board materials.
[E] Although at least one of the test programs asks you how long you have to prepare to take the examination in order to customize the learning curve, all recommend spending a period of weeks, not hours, using the software.
[F] But though many programs offer money-back guarantees, professional test writers tend to scoff at those claims. In their mind, such programs overemphasize its functions.
[G] SAT and ACT is popular with the international students, especially Asian students. Many Asian students chase their dream through SAT and ACT.

纳税人改变单位名称或法人代表不需要办理税务登记。 ( )

目前，北京市规定在公共场所禁止吸烟。京华大学国际工商学院将自己的教学楼整个划定为禁烟区。结果发现有不少人在教学楼厕所里偷偷吸烟，这一情况使得法规和校纪受到侵犯。有人建议，应当把教学楼的厕所定为吸烟区，这样，将使得烟民们有一个抽烟的地方而又不会使人们违反规定。 下列哪项如果为真，最能削弱上述建议的可行性( )

A．新的规定会把厕所的卫生和环境搞得非常糟糕，对不吸烟的人是不公平的。

B．抽烟的人会使厕所变成一个“烟囱”，而且不利于烟民们戒烟。

C．当新规定实施后，那些烟民中的有些人又会逐渐在教学楼内厕所以外其他的禁烟区吸烟。

D．在厕所吸烟多了，在其他戒烟区发现违法者的可能性就小多了。

粪便镜检，查到大量白细胞最常见于（）

A．阿米巴痢疾

B．细菌性痢疾

C．上消化道出血

D．直肠息肉

E．寄生虫病

刑事诉讼中的辩护人，或者是犯罪嫌疑人、被告人委托的，或者由人民法院指定的，对于辩护人来说，他的辩护( )。

A．应受受委托的犯罪嫌疑人，被告人要求的约束
B．要受指定他的人民法院的意见的约束
C．要受同是维护社会利益和公诉人的意见的约束
D．依法独立自主地辩护，而不受委托人、法院、公诉人意见的约束