针对我国的人口问题,漫画《地球的眼泪》形象地说明了(　　)

    For me, living in Canada for 25 years, China is a new world that I have longed to explore. This spring, I c____ Yangzhou to be my first stop on a 16-month trip around China. It was like love at first sight. At 15, I bought a book of collection of p____about Tang Dynasty. Through it, I heard of Yangzhou for the first time. I was deeply attracted by a poem written by Li Bai – “Sailing to Yangzhou in M____ .

    Yangzhou has always been famous for its gardens. A____them, the Slender West Lake, one of the b____attractions in the city, was my first stop. The park with its fantastic landscape and lots of history has enough to keep a t____busy for the whole day. What a shame I simply could a____half a day!

    My next stop was He Garden, one of the best protected gardens in Yangzhou. It was once owned by the family of He Zhidao in Qing Dynasty. He Zhidao successfully brought Chinese and W____architectural(建筑的) features together.

    Yangzhou is also the starting point of the Grand Canal tour. Taking a boat along the part of the canal in Yangzhou, I was amazed at the liveliness of this ancient waterway and the c____history and culture.

    Luckily, my two-day trip to Yangzhou was filled with p____and wonder. It made me hungry for more China.

著名的企业家俞敏洪曾经说过：“面对困难和挫折，哪怕是最没有希望的事情，只要努力坚持去做，就会拥有希望。”这告诉我们（    ）

①坚持不懈是点燃成功希望的重要条件           ②有坚强意志的人就一定能成功

③坚强意志能让人积极面对挫折并战胜挫折   ④坚强意志使人具有强大的行动力

完成下列关于基因的探索历程的填空．

（1）在肺炎双球菌转化实验中，S型菌有SⅠ、SⅡ、SⅢ等多种类型，R型菌是由SⅡ型突变产生．利用加热杀死的SⅢ与R型菌混合培养，出现了S型菌，有人认为S型菌出现是由于R型菌突变产生，但该实验中出现的S型菌全为____ 型，所以否定了这种说法．

（2）沃森和克里克构建了DNA双螺旋结构模型，该模型用____ 排列顺序的多样性来解释DNA分子的多样性．

（3）乙醇进入人体后的代谢途径如图，请回答：

①以上实例体现了基因通过控制____ ，进而控制生物体的性状．

②有些人喝了一点酒就脸红，我们称为“红脸人”． 经研究发现“红脸人”体内只有ADH，则“红脸人”的基因型有____ 种．此外还有一种人既有ADH，又有ALDH，号称“千杯不醉”，他们的基因型为____ ．