关于x的方程3x﹣（2a﹣1）=5x﹣a+1与$\frac{x+12}{2}$+$\frac{x-4}{3}$=8的解相同，求a的值．

世界上最大的盆地是（    ）

阅读下面小说语段，完成下列各题。

    我的很重的心忽而轻松了，身体也似乎舒展到说不出的大。一出门，便望见月下的平桥内泊着一支白篷的航船，大家跳下船，双喜拔前篙，阿发拔后篙，年幼的都陪我坐在舱中，较大的聚在船尾。母亲送出来吩咐“要小心”的时候，我们已经点开船，在桥石上一磕，退后几尺，即又上前出了桥。于是架起两支橹，一支两人，一里一换，有说笑的，有嚷的，夹着潺潺的船头激水的声音，在左右都是碧绿的豆麦田地的河流中，飞一般径向赵庄前进了。

    两岸的豆麦和河底的水草所发散出来的清香，夹杂在水气中扑面的吹来；月色便朦胧在这水气里。淡黑的起伏的连山，仿佛是踊跃的铁的兽脊似的，都远远地向船尾跑去了，但我却还以为船慢。他们换了四回手，渐望见依稀的赵庄，而且似乎听到歌吹了，还有几点火，料想便是戏台，但或者也许是渔火。

    那声音大概是横笛，宛转，悠扬，使我的心也沉静，然而又自失起来，觉得要和他弥散在含着豆麦蕴藻之香的夜气里了。

一位美国史学家描述道：“…乘船在悲惨的‘中段航程’中横渡大西洋．这些黑色‘货物’上了镣铐，锁在甲板上，没有卫生设备，他们忍受着可怕的待遇…”这里所说的“黑色货物”主要来自于（    ）

    One afternoon, I went into an art museum. While I was ____ for my friend, I saw a young couple (夫妻). The woman was ____ the paintings. The man was quiet all the time. I .thought the man was very nice because nobody would like to be bothered (被打扰) ____ enjoying the paintings.

    I met them a few ____ as I moved through the different rooms of the art museum. Each time I heard the woman talking, I moved away ____

    I was paying for some ____ at the museum shop when the couple walked slowly to the exit (出口). Before they left, the man ____ out a cane (拐杖). "He is a great man," the worker of the shop said. "He ____ not to change his life after his eyes got hurt. He can't see ____ now. He and his wife-come here whenever there is a new art show. "

    "But what can he get from the art? He can't see!" I said.

    "You are wrong. He sees a lot, more than you and I do," the worker said. "His wife ____ each painting so he can see it."