命题p：方程x2﹣x+a2﹣6a=0有一正根和一负根．命题q：函数y=x2+（a

天冬糖精也是常用的糖味剂，大约比蔗糖甜180倍，它的结构简式为：

， 根据你所学的知识判断下列说法正确的是  [ ]

A．天冬糖精有甜昧，属于糖类

B．天冬糖精在人体不能发生水解，但该物质能溶于水

C．天冬糖精在人体内像肽一样代谢

D．天冬糖精能与NaOH溶液反应但不能与盐酸反应

（10分）某化学兴趣小组为了测定某石灰石样品中碳酸钙的质量分数，取用2.0 g石灰石样品，把25.0g质量分数为10%的稀盐酸分五次加入样品中（样品中的杂质既不与盐酸反应，也不溶解于水），每次充分反应后都经过滤、干燥、称量，得实验数据如下：

（1）2.0g石灰石样品中碳酸钙的质量为     ，石灰石中碳酸钙的质量分数为      。

（2）请你继续计算反应生成溶液中氯化钙的质量分数（计算过程和结果均保留一位小数）

与阑尾相连接的大肠是（）

A．横结肠

B．降结肠

C．乙状结肠

D．盲肠

E．直肠

Part I Reading ComprehensionDirections: There are three reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four suggested answers marked A, B,C and D.Choose the best answer to each question.Questions 1 to 5 are based on the following passage: ( 10 分 )Every artist knows in his heart that he is saying something to the public. Not only does he wantto say it well,but he wants it to be something which has not been said before. He hopes the publicwill listen and understand--he wants to teach them, and he wants them to learn from him. Whatvisual artists like painters want to teach is easy to make out but difficult to explain, because painterstranslate their experiences into shapes and colors, not words. They seem to feel that a certainselection of shapes and colors, out of the countless billions possible, is exceptionally interesting forthem and worth showing to us. Without their work we should never have noticed these particularshapes and colors, or have felt the delight which they brought to the artist. Most artists take theirshapes and colors from the world of nature and from human bodies in motion and repose; theirchoices indicate that these aspects of the world are worth looking at, that they contain beautifulsights. Contemporary artists might say that they merely choose subjects that provide an interestingpattern, that there is nothing more in it. Yet even they do not choose entirely without reference to thecharacter of their subjects. If one painter chooses to paint a gangrenous (生坏疽的) leg and another alake in moonlight, each of them is directing our attention to a certain aspect of the world. Eachpainter is telling us something, showing us something, emphasizing something---all of which meanthat, consciously or unconsciously, he is trying to teach us.

All artists are common in that（ ）

A．they use shapes and colors instead of words

B．they are trying to teach the public

C．whaat they want to teach is difficult to explain

D．they want to learn from the public

印度、埃及和菲律宾等国经济属于（）

A.自给型经济

B.原料出口型经济

C.工业化进程中的经济

D.工业化经济