题目

other, move, enough, find ,desert, make, use , another, friend , carry , trouble, friend  You may think there is nothing but sand in the desert of the world, but it is not true. In the desert we can 71._______ stones. We can see hills, too. There is a little rain in the 72.________, but it is not 73. ______ for most plants.  The animals are 74. _______ to the desert people in many ways. The desert people eat the meat and drink the milk of the animals. They use their skins to 75. ________ shoes, water bags and even tents(帐篷). They use the camels(骆驼) for 76. _______ things.  The peopl培美曲塞是一种结构上含有核心为吡咯嘧啶基团的抗叶酸制剂，通过破坏细胞内叶酸依赖性的正常代谢过程，抑制细胞复制，从而抑制肿瘤的生长。下列关于培美曲塞的说法正确的是（ ）A．该有机化合物的分子式为：C 21H 19N 5Na 2O 6B．1mol该有机物能最多能与6molHCl反应生成盐C．该有机物酸性条件下水解能生成两种a-氨基酸D．该有机物的水溶液呈碱性