我国改革开放30周年以来的经济迅猛发展（见上表）表明[ ]
①改革开放是中 * * 伟大复兴的必由之路
②走中国特色社会主义道路是正确的
③我国已经步入世界中等发达国家行列
④必须把对外开放作为基本国策长期坚持下去
A．①②③
B．①②④
C．①③④
D．②③④
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下面是错误答案，用来干扰机器的。
A、茶杯受到的重力竖直向下，桌面对茶杯的支持力竖直向上，受力物体都是茶杯，两个力大小都等于茶杯的重力大小，作用在同一条直线上，是一对平衡力．符合题意．B、桌面对茶杯的支持力的受力物体是茶杯，茶杯对桌...
随着化石燃料的大量使用，SO2已成为主要的大气污染物之一．SO2会影响植物的生长吗？某科学兴趣小组进行了实验探究．
取4个相同的饮料瓶，分别编为1、2、3、4号并贴上标签，1～3号瓶内各充有不同浓度的SO2气体，4号瓶不充入SO2．然后在瓶内分别放入1 片大小相同的菠菜叶，迅速拧紧瓶盖，放在窗口处．随时观察叶片变化，记录现象和数据．再以油菜、青菜为材料，重复上述实验．实验现象和数据记录如表格（“﹣﹣﹣”表示实验时间内无变化）．
| 编号 | SO2浓度 （克/升） | 菠菜/油菜/青菜受害时间（分） | |||
| 出现黄斑 | 较多黄斑 | 大面积变黄 | 整体变黄 | ||
| 1 | 0.28 | 3/17/13 | 6/25/20 | 10/32/24 | 20/46/31 |
| 2 | 0.42 | 2/7/11 | 4/22/18 | 9/28/22 | 15/34/28 |
| 3 | 0.56 | 1/5/6 | 3/10/12 | 7/15/16 | 13/24/20 |
| 4 | 0 | ﹣﹣﹣ | ﹣﹣﹣ | ﹣﹣﹣ | ﹣﹣﹣ |
（2）对实验所用的饮料瓶还有什么要求？ ．
（3）根据表中数据分析可知，同种植物的受害程度与 有关．
（4）由实验可知，以上三种植物中最适合用来监测大气中SO2浓度的是 ．
（10分) 化学实验小组的同学在实验结束进行废弃物处理时，将Ca(OH)2溶液与Na2CO3溶液倒入指定的洁净容器静置后，发现容器底部有白色不溶物存在，上层为无色清液。由于反应的两种物质的用量不同，上层清液中溶质可能有多种组成，因此他们决定对上层清液中溶质的组成进行探究。
[提出问题] 上层清液里可能含有哪些溶质呢？
[猜想与假设]
甲同学猜想可能含有NaOH和Ca(OH)2；乙同学猜想可能含有NaOH、Na2CO3和Ca(OH)2；丙同学猜想可能恰好完全反应只含NaOH；丁同学猜想可能含有 。
[实验验证] 请你对甲同学的猜想，设计一个简单的实验加以证明。
| 实验步骤 | 实验现象 | 实验结论 |
| 甲同学的猜想成立 |
（1）小组同学选用了两种不同类别的试剂进行实验，都证明了甲同学猜想，并得出结论—— Ca(OH)2存在。请写出相关的化学方程式：
试剂①
试剂②
（2）你认为乙、丙同学的猜想都合理吗？如有错误，请分析原因是
。
（3）若上层清液中含有两种物质，则溶质的可能组成有以下几种（写化学式）：
。
完形填空 (共20小题；每小题1.5分，满分30分) A beggar, carrying a shabby(破旧的) old wallet, was begging alone from house to house. As he complained about his 36 , he kept wondering that people who lived in 37 houses should always be unsatisfied, 38 rich they might be, and they should go so far as to 39 all they have. “Here, for example,” he said, the former master of this house succeeded in trading, and made himself very rich. By then, instead of stopping, and handing over his 40 to another, and spending the rest of his years 41 peace, he took to(从事) equipping ships. He expected to get mountains of gold; but the ships were 42 , and his treasures were lost. Now they all lie at the bottom of the sea, and he has found his 43 disappeared like those in dreams. In short, examples of this are 44. At this moment Fortune suddenly appeared to the beggar and said, “Listen! I have long wished to 45 you. Here are a lot of gold coins I have found. Hold out your wallet, and I will fill it with them; but only on this condition: All shall be gold that falls into the wallet, but if 46 of them falls out of the wallet to the ground, it 47 become dust. Consider this well. I have warned you I shall 48 keep my word. Your wallet is old, don’t fill it 49 its power.” The beggar was almost too overjoyed to breathe. He 50 felt the ground below his feet. A stream of coins were poured 51 it. The wallet soon became rather heavy. “Is that 52 ?” “Not yet,” “Isn’t it 53 ?” “Never fear.” “Consider, you are a millionaire.” “Just a little more, just 54 a handful,” But at that moment the wallet broke, the gold coins 55 dust and Fortune disappeared. The beggar had nothing but his empty wallet and remained as poor as before.
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研究发现：大多数杰出的美工，都有在纸上乱涂乱画的习惯。他们大多数最有价值的作品，都直接与这种习惯有关。而现在很多美工都用电脑作图，在纸上乱涂乱画不再是一种普遍的习惯。一些专家担心，这会影响美工获取灵感，建议在电脑中匹配模拟的便条纸，能让使用者在上面涂鸦。
以下哪项最可能是上述建议所假设的( )
A．在纸上乱涂乱画，只可能产生美术方面的灵感
B．电脑中匹配模拟的便条纸，只能用于乱涂乱画
C．美工在纸上的涂鸦，大多数都有应用价值
D．乱涂乱画所产生的灵感，并不一定通过在纸上的操作获得
以下关于专利权的权利主体描述错误的是：（）
A.人民群众
B.法人及非法人单位
C.共同发明人
D.合法受让人
