15.Which kind of dinosaurs was the longest?A.Stegosaurus B.Apatosaurus C.Diplodocus D.Brachiosaurus

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15.Which kind of dinosaurs was the longest?A.Stegosaurus B.Apatosaurus C.Diplodocus D.Brachiosaurus
15.Which kind of dinosaurs was the longest?
A.Stegosaurus B.Apatosaurus C.Diplodocus D.Brachiosaurus

15.Which kind of dinosaurs was the longest?A.Stegosaurus B.Apatosaurus C.Diplodocus D.Brachiosaurus
选C,梁龙
原因：
哪一种恐龙最长?
除去巨龙(Ultrasaurus)——它可能长达三十米——最长的恐龙或许是梁龙(Diplodocus) ,古生学家对此极为肯定,因为有完整的骨架已被发掘,显示出梁龙即使没有完全伸展,可长二十七公尺长.仅颈部就有八公尺长,尾巴可达十三点七公尺长,工程学者常说它的身体结构就像是一座悬梁桥一样.
另外还有一类恐龙和梁龙一般长.就是重型龙(Barosaurus) ,它和梁龙有亲缘关系,但在身体比例上截然不同.它的尾巴很短,但颈部长达九点二米.有些科学家认为,当重型龙抬起它的脑袋,血液可能就会停止流到头部,因此假使它要伸长脖子去摄取树梢上的嫩叶,它则必需很快的咬下来!
到底27米长是多长?恐龙书永远告诉孩子说,梁龙比两辆校车还要长.孩子真的关心校车到底有多长吗?孩子们会关心一些较重要的事情,像 MarsBar（巧克力棒）有多长,口香糖的长度,以及多少Reese's Pieces才排成一英寸.因此,让我们以孩子而言适切的语言来描述：例如,从梁龙的鼻子到尾端,将要用到二百七十根 Mars Bars,所以,如果孩子每天吃一根Bars,将会耗掉大部份的一学年时间顺著梁龙长度走,假如他沿著梁龙的脊骨排口香糖,那么以每天3块的速率,将花费二年的时间,从一端嚼完到另一端,那么Reese's Pieces呢?连 ET 都会厌烦,要完成整个梁龙的长度他必须吃完4320个Reese's Rieces.这种描述或许是比较适切的.
在蒙古发掘的马门溪龙(Mamenchisaurus),属于梁龙类,具有所有恐龙中最长的脖子,马门溪龙的整个长度可能达二十七公尺,而脖子的本身就有九公尺!它的颈部结构包括了十九块颈骨,有些种单一个颈骨就可达一百五十公分长呢.

哪种恐龙最长……
a剑龙
b 不知道
c梁龙
d腕龙
朋友，你自己看吧。。。

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