有关长江和黄河的叙述不正确的是（ ）
A．长江为我国第一大河，黄河为我国第二大河
B．长江和黄河都流经了青海省、四川省，并都流经了青藏高原地区
C．秦岭为黄河流域和长江流域的分水岭
D．两条河流都流经湿润地区，水量丰富
A、长江为我国第一大河，黄河为我国第二长河，叙述错误，符合题意；
B、长江和黄河都流经青海省和四川省，都流经青藏高原地区，叙述正确，不符合题意；
C、秦岭为东西走向的山脉，是黄河流域与长江流域的分水岭，叙述正确，不符合题意；
D、长江水量丰富，黄河主要流经半干旱和半湿润地区，水量不丰富，叙述错误，符合题意．
故选：AD．
Mark was walking home from school one day when he saw a boy in front of him. He had dropped all of the books he was 16 , along with two sweaters, a basketball and a walkman (随身听). Mark stopped and helped the boy pick the things up. 17 they were going the same way, he helped to carry some of his things. As they walked, Mark 18 that the boy’s name was Bill. He loved computer games, basketball, music and history, 19 he was having trouble with some of his 20 in school. They arrived at Bill’s home first and Mark was 21 in for a Coke and to watch some television. The afternoon passed 22 with a few laughs and some small talk, then Mark went home. They continued to 23 each other at school, had lunch together once or twice a week, and then they 24 finished middle school. Three weeks before they left school, Bill asked Mark if they could talk. Bill reminded Mark of the day years ago when they had first 25 . “Did you ever wonder 26 I was carrying so many things home that day?” asked Bill. “You see, I cleaned out my locker (锁柜) because I didn’t want to leave 27 for anyone else. I was going home to kill myself. But after we 28 some time together talking and laughing, I 29 that if I killed myself, I would have missed many good times. So you see, Mark, when you 30 those books that day, you actually saved my life.”
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