把分别充满红棕色的NO₂气体和无色的H₂的集气瓶按照如图A、B两种方式放置，然后把两瓶中间的玻璃片抽走，使两瓶口密合在一起（不要振荡），可观察到A中两瓶气体的颜色很快趋于一致（两气体不反应），而B中需要很长时间才能达到同样的效果．

由此可以得出的结论有：

（1）____；（2）____ ．

通读下面的短文，掌握其大意，然后从各题所给的A、B、C三个选项中选出一个最佳答案。

Dear Sally,

    How are you? I'm happy that you can do the things you 1 at home. I never have fun, because there are too many 2 in my family. My parents are strict. I have to  3 at six o'clock every morning. And I have to make my bedroom4 before breakfast and then go to school. I can't play with my friends after school. I have to do 5 homework. After dinner I have to take the dog for    6 walk in the park. I can't watch TV on school nights. I have to  7 the violin for an hour. I can't go to bed late. I have to be in bed 8 nine o'clock. On weekends I have to clean my room and 9 the dishes. I also have to go to learn the violin on Sundays. I'm 10  tired. Can you help me?

                                                                                                                                                                    Yours,  

                                                                                                                                                                      Lisa

从北半球的春分日到夏至日，太阳直射点在地球上的运动过程是

依次填入下列各句横线处的词语，最恰当的一组是（    ）

①电视剧《钢铁是怎样炼成的》播出后，在广大青年中引起________。

②由于环境污染和一些人为的原因，阿尔巴斯白山羊绒的品质在________。

③太阳黑子又进入集中爆发期，我国天文学家从去年8月就开始密切________太阳的活动。