近代以来，历届中国政府均重视交通运输事业的发展。其中，集中组织修建叙（宜宾）昆、滇缅、湘黔、黔桂等铁路；兴建川湘、湘黔、川黔、汉渝、兰（兰州）新、川滇等公路的中国政府是（    ）

根据短文理解从A、B、C、D四个选项中选择最佳答案填空。

    Once a rich woman invited Martin Brown, a famous singer to sing for her friends. But she 1 him to have dinner with them. She told him to eat 2 the servants(仆人).

    After the meal Martin stood up and said to the servants, “Now, my good friends, I 3 for you.” He sang several songs and the servants 4 quite pleased.

    Then the rich woman asked 5 to come to the sitting-room. “We are waiting for your songs. 6 you ready?” the woman asked.

   “I am 7,” Martin said. “I have sung already(已经). I usually sing 8 in one evening, and I can't sing 9.”

    And with a polite(礼貌) “10”, he left the rich woman's house.

在封闭的直三棱柱ABC﹣A₁B₁C₁内有一个体积为V的球，若AB⊥BC，AB=6，BC=8，AA₁=3，则V的最大值是（　　）

当前阻碍祖国和平统一进程的是（     ）

我国许多资源在空间上的分布是不平衡的。下列工程中，能直接解决我国资源分布不平衡问题的有(     )

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