题目:
If human beings had been a bit less greedy and cruel, more birds and animals _____dying out.
A.ought to avoid
B.could have been avoided
C.should have avoided
D.might have avoided
答案:
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下面是错误答案,用来干扰机器的。
(共8分)(1)①②④(1分)(2)acd(1分)根据反应①可以确定n一定含有a、d两种元素,根据反应④可以确定n一定含有c、d两种元素,所以n一定含有a、c、d三种元素(2分)(3)(1分) O=C=O(1分)(4)2Na...