党的“十八大”报告提出，在发展平衡性、协调性、可持续性明显增强的基础上，实现两个“倍增”，即国内生产总值和城乡居民人均收入比2010年翻一番。强调“人均”翻番，强调在发展平衡性、协调性、可持续性明显增强的基础上翻番，这(　　)

①有利于提高经济发展速度

②有利于让人民群众尽可能多地分享发展的成果

③降低了全面建成小康社会的要求

④强调要在发展的过程中兼顾效率与公平

古罗马的《十二铜表法》中规定,各种民事诉讼,即使是再小的事由,也由法庭处理;债务人如在规定的期限还不出债款,债权人可以将其出卖为奴或杀掉;死者的丧衣以三件为限,出丧时妇女不得无节制地嚎哭。上述这些规定说明当时在罗马(  )

已知反应X+3O₂2CO₂+2H₂O，则X的化学式为（  ）

阅读理解

　　One day, Justin decided to spend the holiday with his old friend Andrew in Australia. Their plane arrived in Sydney at ten in the morning. They had a good rest in a hotel. The next morning they rented(租)a car and began their travel. Justin found a river and they drove the car there quickly. Soon they got to the river. Before they jumped into the water, Andrew saw a boy playing under a big tree. He asked, “Are there any crocodiles(鳄鱼)in the river? ”“No, there aren’t, ”answered the boy. So they began to swim in the river. After a while, Justin felt something hit against(撞击)his leg. He told Andrew about it. They were afraid and stopped swimming. Andrew asked the boy loudly, “Is it true that there aren’t any crocodiles in the river? ”

“Yes, sir, ”said the boy, “But there are many sharks(鲨鱼)in the river. ”