在电场中A点放入一个电荷量为2×10^﹣6C的正试探电荷，它受到的电场力为1×10^﹣3N，则A点的电场强度为____ N/C，若将正试探电荷的电荷量减为1×10^﹣6C，则A点的电场强度为____ N/C．

    “How can I learn English well?” “This is a 1 many students may ask. In my opinion, the most effective(有效的) 2 is to learn lessons by heart. If you can recite the text and write it out, you will learn it pretty well. And if you can tell 3 your own words about 4 the lesson says, you are a very successful learner indeed. Your English will be quite perfect.

    This is a difficult task. However, if you try to learn by heart only part of each lesson, you'll find it not so hard 5 you might have thought.

    Learn this way, and you will 6 fast progress. Of course, writing is also necessary. It helps you a lot on your way to 7 in English studies.

    It's equally(同样地) important to feel the language. You should laugh at English jokes and be 8 at bad news. When using English, try to 9 your mother tongue(母语). 10 helping you, your own language gets in your way. So, never try to learn English through putting every word into Chinese.

政治制度有一定的连续性，开明的政治制度对巩固国家的统治、稳定社会秩序有很大的作用。请结合所学知识，回答下列问题。

材料一：及秦孝公用商君，坏井田，开阡陌，急耕战之赏。 虽非古道，犹以务本之故，倾邻国而雄诸侯。──《汉书•食货志》

材料二：秦朝建立后继续加强中央集权，看图一回答问题

材料三：观察图二、图三回答问题

已知函数f（x）=|x+1|﹣|x|+a．