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【单选题】
The general manager’s letter, which gave him credit, _____ his promotion.A.
insured
B.
assured
C.
ensured
D.
reassured
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举一反三
【单选题】A) They are part of their nature. B) They are subject to change. C) They are related to culture. D) They are beyond control.
A.
They are part of their nature.
B.
They are subject to change.
C.
They are related to culture.
D.
They are beyond control.
【简答题】已知二次函数 的零点是－1和3，当 时， ，且 。（1）求该二次函数的解析式；（2）求函数 的最大值。
【简答题】关于二次函数学生甲有以下观点：①二次函数必有最大值；②二次函数必有最小值；③闭区间上的二次函数必定同时存在最大值，最小值；④对于命题③，最值一定在区间端点取得．你认为学生甲正确的观点序号是 ______．根据你的判断试解决下述问题：已知函数f（x）=ax 2 +（2a-1）x+1在 [- 3 2 ，2] 上的最大值为3，求实数a的值．
【简答题】关于二次函数学生甲有以下观点：①二次函数必有最大值；②二次函数必有最小值；③闭区间上的二次函数必定同时存在最大值，最小值；④对于命题③，最值一定在区间端点取得。 你认为学生甲正确的观点序号是________。 根据你的判断试解决下述问题： 已知函数 在 上的最大值为3，求实数a的值。
【简答题】A. They admit their mistakes. B. They are open to criticism. C. They are willing to learn. D. They’re in charge of their emotions. E. They apologize when needed. F. They are generous with compliments....
【单选题】听力原文：(A) They are watching the race. (B) They are parking their bikes. (C) They are riding bikes over rocks. (D) They are getting on bicycles.
A.
B.
C.
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