在磁感应强度B的匀强磁场中，垂直于磁场放入一段通电导线。若任意时刻该导线中有N个以速度v做定向移动的电荷，每个电荷的电量为q。则每个电荷所受的洛伦兹力f＝____，该段导线所受的安培力为F＝____。

材料一：（秦孝公）有席卷天下，包举宇内，囊括四海之意，并吞八荒之心。当是时也，商君佐之，内立法度，务耕织，修守战之具，外连衡而斗诸侯。于是秦人拱手而取西河之外。

——贾谊《过秦论》

材料二：“始知李太守，伯禹亦不如。”

    ①古老的济南，城内那么狭窄，城外又那么_______，山坡上卧着些小村庄，小村庄的房顶上卧着点儿雪，对，这是张小水墨画，也许是唐代的名手画的吧。

    ②那水呢，不但不结冰，反倒在绿萍上冒着点儿热气。水藻真绿，把终年贮蓄的绿色全拿出来了。A天儿越晴，水藻越绿，就凭这些绿的精神，水也不忍得冻上；况且那长枝的垂柳还要在水里照个影儿呢。B看吧，由澄清的河水慢慢往上看吧，空中，半空中，天上，自上而下全是那么清亮，那么蓝汪汪的，整个的是块空灵的蓝水晶。这块水晶里，包着红屋顶、黄草山，像地毯上的小团花的小灰色树影。这就是冬天的济南。

乙醚是人类很早就使用的麻醉剂，分子结构如图所示，其中短线表示原子间的连接，如水分子的结构可表示为H—O—H。乙醚由  ____  种元素组成，相对分子质量是   ____   ，氧元素的质量分数为 ____       。

根据短文理解，从A、B、C、D四个选项中选择正确答案填空。

    As we all know, the environment around us is getting worse and worse. In some places we can't see fish 1 in the river or trees on the hills. Some people even have no clean water to drink.

    Recently, a new lifestyle called low carbon life is 2 every corner of our country. The meaning of low carbon is 3 energy and no waste. It is such an important project that I can't wait 4 my ideas on how to promote it.

    First, we should 5 a no-car day every week in our school. Because cars not only cause serious air pollution but also waste energy. 6 the no-car day, neither students 7 teachers are allowed to drive to school. At the same time, just walk or run. Use our 8 and enjoy the fun.

    Second, we had better not use plastic bags 9. No one can stand the “white pollution”, 10 it is wise to use cloth bags which can 11 again and again.

    12, one thing 13 we should keep in mind is that every big thing comes from the small details. So, as students, we ought to turn 14 the lights the moment we leave, use 15 sides of the paper, and reuse our textbooks and so on.

    All in all, it weighs greatly for all of us to put the low carbon lifestyle into practice. Just set our mind to these: no-car days, no plastic bags, and no waste. Let's do it now.