阳光可以照到洋面下30英尺的地方，这股力量真使我惊奇。太阳光强有力地穿过水层，把水中的颜色驱散，我可以清楚地分辨100米以内的物体。百米之外，水底现出蓝天一般的渐次晕淡的不同色度，在远处变成浅蓝，没入模糊的黑暗中。真的，在我周围的这水实在不过是一种空气，虽然密度较地上的空气大，但透明的情形跟地上空气相仿。在我头上，我又看见那平静无波的海面。

“当年曾分田翻身当家作主人，今天又分田勤劳致富奔小康．”对联中两次“分田”指的是（　　）

请阅读下面短文，选择最佳答案，将其标号在答题卡上涂黑。
   Smiling is the best way of making friends.
   When I was thirteen 1 old, my father found a job in the city. So my family moved there. I also came to a 2 school near where we live. My old school was far away. At first, I did not know anyone in my class. I was very lonely3 I was afraid to make friends with my classmates. I4talk to anyone about my problem, and I didn’t want my parents to 5 me.
   Then one day, something good happened. I was sitting at my desk6 as usual while my classmates were talking happily with each other. At that moment, 7 came into the classroom. I didn’t know who he was. He passed me and then turned back. He looked 8 me and, without a word, smiled. Suddenly, I felt happy, lively and warm. That smile changed my life. I started to talk with the other classmates and made friends. Day by day, I became9 to everyone in my class.
   10 the smile, I have moved on to a new life. Now, I believe that the world is what you think it is. So smile at the world and it will smile back.

推理填空：
如图，已知∠1=∠2，∠B=∠C，可推得AB∥CD．理由如下：
因为∠1=∠2（已知），且∠1=∠4（①理由：____ ）
所以∠2=∠4 （等量代换）
所以CE∥BF （②理由：____ ）
所以∠C =∠3（③理由：____  ）
又因为∠B=∠C（已知），
所以∠3=∠B（等量代换）
所以AB∥CD （④理由：____ ）