某DNA片段的碱基序列为GCTACTAAGC，它的互补链顺序应为______。_爱下问搜题

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问题填空题

某DNA片段的碱基序列为GCTACTAAGC，它的互补链顺序应为______。

答案

参考答案：GCTTAGTAGC

多项选择题案例分析题

案例二：一般资料：求助者，女性，35岁，教师。案例介绍：求助者是市级模范教师，十多年来一直担任某重点学校高三毕业班班主任。所带班是实验班，班里学习气氛好，绝大部分同学都能努力学习。连续多年所带学生考入重点大学的比例都名列前茅。求助者对学生的学习抓得很紧，目标是全校第一。为此投入了大量精力，很少有时间照顾自己的丈夫，儿子即将参加小学升初中的考试，她也难以顾及，丈夫儿子虽能理解但也偶尔出现怨言，自己对此很内疚。今年新学期开始后不久，求助者常常感到力不从心，疲惫不堪。上课时感觉头晕.发胀，浑身乏力，有时出虚汗，近期还经常失眠。认为自己老了，已经不再像年轻时一样有旺盛的精力了。为此情绪低落，烦恼，不想做事，工作热情和效率都大幅下降。想以健康原因向学校提出辞去班主任，调换工作岗位，但考虑到学生就要参加高考，于心不忍，想干好又觉得力不从心。为此非常焦虑，害怕自己这种状态毁了班里学生。心理咨询师观察了解到的情况：求助者是某名牌大学硕士，高级教师，是学校里公认的拼命三郎，教学成绩突出，经常受到校方表扬，对自己期望很高，要求很严，为人严谨，性格较为内向。一年前曾做胆囊切除手术，术后恢复良好，半年前学校体检，未见明显躯体疾病。

该案例中求助者产生心理问题的心理原因是（）。

A.教学成绩突出

B.调换工作岗位

C.自我要求严格

D.害怕影响学生高考

完形填空

Nowadays it is found that school students seldom pay much attention to sports. Is it because they have no  32   in sports? It may not be the fact. They often say they have   33  more important things to do.
   34  are these important things? Examinations! They have to   35    themselves for the most important School Certificates of Education Examination（毕业会考）, and also to    36    with the test and the exams in school. So many of them tend to    37   bookworms.
In the summer holidays of the former years they could do   38    they liked, but in the summer holidays of the   39    years, they have to    40    all their time to the preparation. So studies have    41    them from going in sports.
Because of the pressure    42    their parents and teachers, they have to work harder and spend most of their time on books. Many parents    43    their children to pass this examination in order to get a stepping stone for higher studies or better jobs. As for the    44    themselves, they want to get good results so that they can    45    their studies in the universities. So it is necessary that they    46    up their school activities, especially sports.
Indeed, a complete education cannot go    47    physical training, for a quick mind seldom    48    along with a weak body. It is well said, “All work no play    49    Jack a dull（迟钝的）boy.” In one word, without a strong body, you can never    50    anything, let alone a great success in   51

D．examinations