阅读下列材料，完成小题。

    所谓“手之舞之、足之蹈之，而不自知其然”。和之生于心，其可见者如此。后之为乐者，文备而实不足。乐师之志，主于中节奏、谐声律而已。古之乐师皆能通天下之志故其哀乐成于心然后宣于声则必有形容以表之故乐有志声有容。其所以感人深者，不独出于器而已。

（选自沈括《乐律》，有删改）

根据短文理解，选择正确答案。

    We know the mosquito very well. Mosquitoes fly everywhere. They are almost all over the world, and there are more than 2, 500 kinds of them.

No one likes the mosquito. But the mosquito may decide that she loves you. She? Yes, she. It's true that the male mosquito doesn't bite and only the female mosquito bites because she needs blood to lay (产) eggs. She is always looking for things or people she wants to bite. If she likes what she finds, she bites. But if she doesn't like your blood, she will turn to someone else for more delicious blood. Next time a mosquito bites you, just remember she chooses you. You're different from the others!

    If the mosquito likes you, she lands on your body without letting you know. She bites yon so quickly and quietly that you may not feel anything different. After she bites, you will have an itch (痒) on your body because she put something from her mouth together with your blood. By the time the itch begins, she has flown away.

And then what happens? Well, after the delicious dinner, the mosquito feels tired. She just wants to find a place to have a good rest. There, on a leaf or a wall, she begins to lay eggs, hundreds of eggs.

“地道战”、“地雷战”、“鸡毛信”、“小兵张嘎”是哪个时期的历史事件的反映？

已知椭圆$\frac{x^2}{a^2}+\frac{y^2}{b^2}-1$（a＞b＞0）上一点A关于原点的对称点为B，F为其左焦点，若AF⊥BF，设∠ABF=θ，且θ∈$\frac{\mathrm{\pi }}{6}$，$\frac{\mathrm{\pi }}{3}$，则该椭圆离心率e的取值范围为____ 

甲、乙两人同时从图书馆走向教室，甲一半路程步行，一半路程跑步；乙一半时间步行，一半时间跑步，若两人步行、跑步的速度一样，则先到教室的是