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【单选题】
小儿骨骼系统与不完全相同，以下描述哪一项是不正确的A.
小儿骨骼的主要基质是由交错的原结缔纤维构成
B.
小儿骨骼的固体成分无机盐成分少，因此弹性大，不易折断
C.
随着年龄增长，骨骼中的板层组织逐渐增多，至发育年龄后骨组织几乎完全呈板状排列
D.
小儿骨骼的新生和吸收过程均活跃，骨组织的再生能力较大
E.
代谢和免疫等成人所具有的生理功能
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【单选题】Rock climbing is so popular now that many people are able to ______ the steepest face with great agility.
A.
scale
B.
surpass
C.
overcome
D.
mount
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【单选题】So violently ______ to be mad that for a moment or two the Princess was unable even to whisper in her ear.
A.
did she pretend
B.
she pretended
C.
pretended she
D.
had she pretended
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【单选题】While he was climbing the high mountain, he had his leg ______.
A.
broke
B.
break
C.
broken
D.
breaking
【单选题】I can't understand _______ Apple's iPad 2. [ ]
A.
why are they so mad about
B.
why they are so mad about
C.
how are they so mad about
D.
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