某单位买了一批苹果，若每人分6筐，则余5筐，若每人分7筐，则少8筐。试问该单位共有多

某化学兴趣小组为探究Cl₂、Br₂、Fe³⁺的氧化性强弱，设计了如下实验：

①检查气体发生装置A的气密性的操作是                                            。

②整套实验装置存在一处明显的不足，请指出：                              。

（2）用改正后的装置进行实验，实验过程如下：

（3）因忙于观察和记录，没有及时停止反应，D、E中均发生了新的变化。

D装置中：红色慢慢褪去。

E装置中：CCl₄层先由无色变为橙色，后颜色逐渐加深，直至变成红色。

为探究上述实验现象的本质，小组同学查得资料如下：

①请用平衡移动原理（结合化学用语）解释Cl₂过量时D中溶液红色褪去的原因：

                                                                         ，

请设计简单实验证明上述解释：                                                  。

②欲探究E中颜色变化的原因，设计实验如下：

用分液漏斗分离出E的下层溶液，蒸馏、收集红色物质，取少量，加入AgNO₃溶液，结果观察到仅有白色沉淀产生。请结合化学用语解释仅产生白色沉淀的原因：                                    。

③将少量BrCl通入到碘化钾溶液中，该反应的化学方程式为                                  。

目前，我国非公有制经济上缴国家的税收比重不断增加，95%中小企业是非公有制经济，私营企业和个体工商户从业人员共约1.5亿。这说明非公有制经济[ ]

A．对国民经济起支配作用

B．是支撑国民经济的主体

C．为国民经济注入活力

D．主要分布在第三产业

简述葡萄酒陈酿的目的和意义？

America is a country on the move. In unheardof numbers, people of all ages are exercising  their way to better health. According to the latest figures, 4 percent of American adults exercise regularly-up 12 percent from just two years ago and more than double the figure of 25 years ago. Even non-exercisers believe they would be more attractive and confident if they were more active.

It is hard not to get the message. The virtues of physical fitness are shown on magazine covers, postage stamps, and television ads of everything from beauty soaps to travel books. Exercise as a part of daily life did not catch on until the late 195s when research by military doctors began to show the health benefits of doing regular physical exercises. Growing publicity (宣传) for races held in American cities helped fuel a strong interest in the ancient sport of running. Although running has leveled off in recent years as Americans have discovered equally rewarding-and sometimes safer-forms of exercise, such as walking and swimming, running remains the most popular form of exercise.

As the popularity of exercise continues to mount, so does scientific evidence of its health benefits. The key to fitness is exercising the major muscle groups vigorously (强有力地) enough to approximately double the heart rate and keep it doubled for 20 to 30 minutes at a time. Doing such physical exercises three times or more a week will produce considerable improvements in physical health in about three months.

5.It can be learnt from the passage that the health benefits of exercise .

A.are to be further studied                     B.are selfevident

C.are yet to be proved                         D.are supported by scientific evidence

6.A growing interest in sports developed after___________ .

A.an increasing number of races were held in American cities

B.research showed their health benefits

C.scientific evidence of health benefits was shown on TV ads

D.people got the message from magazine covers and postage stamps

7.Which of the following would be the best title for the passage?

A.Exercise-The Road to Health                 B.Scientific Evidence of Health Benefits

C.Different Forms of Exercise                  D.Running-A Popular Form of Sport

8.Which of the following is closest in meaning to the phrase “leveled off” in the paragraph 2?

A.“reached its lowest level in popularity”         B.“stopped being popular”

C.“stopped increasing in popularity”             D.“become very popular”

多分布于指侧缘为（）。

A.手部湿疹

B.手癣

C.两者都是

D.两者都不是