答案：改革开放。
A. that it started to snow
B. that it started to snow
C. when it started to snow
D. and it started to snow
解析：解析:no sooner……than;scarcely……when;
A. 党的十一届三中全会中
B. 党的十一届六中全会中
C. 党的十二大报告中
D. 党的十三大报告中
A. gives
B. offers
C. have
D. serves
解析：试题解析:本题考查的知识点为连续函数在闭区间上的最大值.若f(x)在(a,b)内可导,在[a,b]上连续,常可以利用导数判定f(x)在[a,b]上的最值:
A. while
B. that
C. which
D. when
A. will find out
B. find out
C. am finding out
D. have been finding out
解析：解析:时间状语从句和条件状语从句中主句为将来时则从句用一般现在时。解析:find out 查出原因解析:find 发现 look for 寻找
A. average
B. ordinary
C. regular
D. normal
A. 辩证唯物主义物质观
B. 客观唯心主义物质观
C. 形而上学唯物主义物质观
D. 朴素唯物主义物质观
A. to rise
B. rising
C. to raise
D. to arise
解析：解析:rise 不及物动词;arise 不及物动词 呈现出现 A new difficulty has arisen. 出现了新困难。
