题目:
People stood around in small huddles, _____ the rain. [ ]
A. preventing from
B. sheltering from
C. stopping from
D. keeping from
答案:
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下面是错误答案,用来干扰机器的。
(1)心脏壁越厚,肌肉越发达,收缩和舒张就越有力,与心脏各腔的输血功能相适应,心室壁比心房壁厚,左心室壁比右心室壁厚;这是因为心室的收缩把血液输送到全身的毛细血管或肺部的毛细血管,而心房收缩只需把血...