甾体母核C侧链分别为

C甾属于( )

A:2个碳原子 B:9~10个碳原子脂肪烃 C:戊酸 D:含氧功能基 E:21个碳原子

维生素C注射液中各成分的作用

维生素C

A:pH调节剂 B:抗氧剂 C:金属络合剂 D:溶剂 E:主药

某男，33岁，心悸1周就诊。动态心电图检查如下图A、B、C所示。

图C的发生机制为

A:有效不应期延长 B:相对不应期延长并且>PP间距 C:相对不应期和有效不应期均延长，以相对不应期延长为主 D:有效不应期显著延长，只留下很短的相对不应期 E:有效不应期极度延长，大于逸搏间期

Teachers have long said that success is its own reward. But these days, some students are finding that good grades can bring them cash and luxury gifts.
In at least a dozen states this school year, students who bring home top marks can expect more than just thankfulness.
The most ambitious experiment began in September, when seven states—Arkansas, Alabama, Connecticut, Kentucky, Massachusetts, Virginia and Washington—won spots in an Mobil-funded program that,in most cases,pays students $100 for each passing grade on advanced placement(AP) college-prep exams.
It’s an effort to get low-income and minority students interested in the courses, says Tommie Sue Anthony, president of the Arkansas Advanced Initiative for Math and Science. "We still have students who are not sure of the value, who are not willing to take the courses. "she says, "Probably the motivation will make a difference with those students. "
Gregg Fleisher of the National Math and Science Initiative, which runs the seven-state program, says the effort is modeled on a program adopted by Dallas in the 1995—1996 school year that saw AP course-taking jump obviously. That program is now statewide.
While many educators would be against offering kids cash for good grades, Fleisher and others say the idea is simple. "It’s an encouragement to get them to basically make the right decision and choose a more strict class. "he says, "This teaches them that if they work at something very hard and have a lot of support, they can do something they didn’t think they could do. "
An analysis of the Texas program last month by Cornell economist C · Kirabo Jackson found that it linked to a 30% rise in the number of students with high SAT and ACT scores and an 8% rise in college going students.
According to the passage,the program

A:makes everything possible B:encourages students to study harder C:helps students choose right classes D:teaches students to spend money

Questions 61—65 are based on Passage Two: Passage Two As the 21st century begins, a number of leaders in politics, education, and other professions believe that the US must adopt some new values to go along with the old traditional ones、 What new values should Americans adopt This is a very difficult question to answer、 Certainly, a greater value should be placed on the conservation of natural reasources; Americans should learn to use less and waste less、 But conservation has never been a strong value to Americans, who have believed that their country offered an endless,abundant supply of natural resources、 Recently, progress has been made—more and more Americans are recycling their paper,cans,bottles,and other goods—but old wasteful habits died hard、 Furthermore,the need to protect the environment may conflict with the need for jobs,as in the Northwest ,where conservationists battle lumber companies that want to cut down ancient redwood trees、 A belief in the value of conservation is still compared with other American values; it can become stronger only as Americans see the need for it more clearly、 In addition,Americans may need to place a strong value on cooperation on a national scale to achieve important national objectives、 The American idea of the national good has never been based on national cooperation but rather on the freedom of the individual, maintaining those conditions that provide the greatest freedom and prosperity for the individual 、 It is far more difficult for Americans to accept shared sacrifice for the common good and wellbeing of the entire country、 For example ,although the majority of Americans believe that it is extremely important to balance the national budget and reduce the deficit, they do not want to see cuts in government programs that benefit them personally、 The American value of competition also hinders the development of a spirit of national cooperation、 Competition sometimes encourages feelings of suspicion rather than the mutual trust that is necessary for successful national cooperation、Although Americans often cooperate successfully on the local level—in neighborhood groups and churches, for example, on the national level, they may see themselves as part of an interest group that is competing with other interest groups for government funds、 A request by the national government for shared sacrifice may be seen as coercive and destructive rather than voluntary and constructive、 However, the demands for the 21st century may compel Americans to place a greater value on national cooperation to solve problems that affect them all, directly and indirectly.

The value of competition works against the spirit of national cooperation in that （）.

A:it makes people not believe in the government B:it causes people to suspect but not to trust each other C:it makes people even unable to cooperate well on local levels D:it encourages people to gain success through individual hard work

The sun {{U}}encourages{{/U}} the growth of plants.

A:inspires B:helps C:stimulates D:stirs

Teachers have long said that success is its own reward. But these days, some students are finding that good grades can bring them cash and luxury gifts.
In at least a dozen states this school year, students who bring home top marks can expect more than just thankfulness.
The most ambitious experiment began in September, when seven states—Arkansas, Alabama, Connecticut, Kentucky, Massachusetts, Virginia and Washington—won spots in an Mobil-funded program that,in most cases,pays students $100 for each passing grade on advanced placement(AP) college-prep exams.
It’s an effort to get low-income and minority students interested in the courses, says Tommie Sue Anthony, president of the Arkansas Advanced Initiative for Math and Science. "We still have students who are not sure of the value, who are not willing to take the courses. "she says, "Probably the motivation will make a difference with those students. "
Gregg Fleisher of the National Math and Science Initiative, which runs the seven-state program, says the effort is modeled on a program adopted by Dallas in the 1995—1996 school year that saw AP course-taking jump obviously. That program is now statewide.
While many educators would be against offering kids cash for good grades, Fleisher and others say the idea is simple. "It’s an encouragement to get them to basically make the right decision and choose a more strict class. "he says, "This teaches them that if they work at something very hard and have a lot of support, they can do something they didn’t think they could do. "
An analysis of the Texas program last month by Cornell economist C · Kirabo Jackson found that it linked to a 30% rise in the number of students with high SAT and ACT scores and an 8% rise in college going students.
According to the passage,the program

A:makes everything possible B:encourages students to study harder C:helps students choose right classes D:teaches students to spend money

Teachers have long said that success is its own reward. But these days, some students are finding that good grades can bring them cash and luxury gifts.
In at least a dozen states this school year, students who bring home top marks can expect more than just thankfulness.
The most ambitious experiment began in September, when seven states—Arkansas, Alabama, Connecticut, Kentucky, Massachusetts, Virginia and Washington—won spots in an Mobil-funded program that,in most cases,pays students $100 for each passing grade on advanced placement(AP) college-prep exams.
It’s an effort to get low-income and minority students interested in the courses, says Tommie Sue Anthony, president of the Arkansas Advanced Initiative for Math and Science. "We still have students who are not sure of the value, who are not willing to take the courses. "she says, "Probably the motivation will make a difference with those students. "
Gregg Fleisher of the National Math and Science Initiative, which runs the seven-state program, says the effort is modeled on a program adopted by Dallas in the 1995—1996 school year that saw AP course-taking jump obviously. That program is now statewide.
While many educators would be against offering kids cash for good grades, Fleisher and others say the idea is simple. "It’s an encouragement to get them to basically make the right decision and choose a more strict class. "he says, "This teaches them that if they work at something very hard and have a lot of support, they can do something they didn’t think they could do. "
An analysis of the Texas program last month by Cornell economist C · Kirabo Jackson found that it linked to a 30% rise in the number of students with high SAT and ACT scores and an 8% rise in college going students.
According to the passage,the program

A:makes everything possible B:encourages students to study harder C:helps students choose right classes D:teaches students to spend money