[单选题]关于历史发展的动力，下列选项中表述正确的是（　　）

正确答案 ：D

革命可以解放生产力

[单选题]We can conclude from this passage that avalanches________

回答下面的题目Never laugh at a snow covered mountain! Laughter and yelling, during the avalanche season, can cause a deadly pile of snow．Huge snow slides are most common in mountains where there are steep slopes that are well buried in snow and ice．The snow builds up slowly and lands very softly．This can create a very touchy, unstable situation．Tons of snow may be held up by only the friction between snowflakes．The deep snow is like a house of cards．The slightest movement can cause it to fall．As soon as something slips, this great mass of snow will come crashing down the mountainside．Slides may be started by sound vibrations．They may also be started by the weight of wet, melting snow．Once an avalanche has been triggered, the cause no longer matters．Moving down a steep slope, it picks up great speed and added snow．Some avalanches travel as fast as two hundred miles per hour．The force of an avalanche will mow down anything in its path．Whole houses have been swallowed up by these fast-paced piles of snow．The wind that is caused by an avalanche is almost as destructive as the snow itself．Winds from an avalanche have been known to travel as fast as those of a tornado．So, when approaching a thickly snow covered mountain, speak softly!Avalanches can be started by________

正确答案 ：C

have killed people

解析：选项A和B在文中并未提及。文中提到雪崩的强大力量，可以毁掉整座房子，人肯定也是有伤亡的。选项C是正确的。

[单选题]Somethingalways _______ wrong when we try this recipe．

正确答案 ：D

goes

[单选题]下列各组词语，只有一个错别字的一组是 (　　)

正确答案 ：C

风靡 蘖根祸种 攀缘 始作俑者

[多选题]膝关节（　　）

正确答案 ：BC

属于滑车关节

关节囊广阔、松弛

[单选题]血中氧分压降低导致呼吸加强的原因是直接兴奋（　　）

正确答案 ：C

外周化学感受器

[单选题]第一心音到第二心音期间代表（　　）

正确答案 ：A

心室舒张期

[单选题]大多数细胞产生和维持静息电位的主要原因是 （　　）

正确答案 ：A

细胞内高K+浓度和安静时膜主要对K+有通透性

[单选题]神经细胞动作电位的超射值接近于 （　　）

正确答案 ：B

钠平衡电位

[单选题]位于输卵管外侧部的是 （　　）

正确答案 ：D

输卵管漏斗部

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