1.单选题- (共6题)













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2.选择题- (共5题)
阅读下文并回答问题。
There are 24 solar terms (节气) in China, and the Grain Rain(谷雨) is one of them. It falls on April 19 this year.
This solar term is called the Grain Rain because it is known for “rain” that helps the grain grow. From its name, we can guess it means a time of more rain. So if you go out in the next two weeks, you may need to bring an umbrella with you.
But this is a great time for planting crops. If you miss the time for planting during the Grain Rain, you will feel sorry later. So maybe you can try to plant some flowers or vegetables in your garden. When the spring rain falls, farmers begin to grow crops (庄稼). Farmers often say, “Spring rain is as precious (珍贵的) as oil.” It brings farmers hope for a good year ahead.
There are also many interesting customs during the Grain Rain. In the northern part of China, people like to eat Chinese toon (椿芽) mixed with eggs. The food made during the Grain Rain tastes wonderful and is good for your stomach. In the southern part of China, the tea leaves are picked during the time. They are called Grain Rain tea, which is famous for its freshness and sweet smell.
3.填空题- (共2题)
4.解答题- (共5题)
(1)求甲、乙两工程队单独完成此项工程各需多少天?
(2)甲工程队单独做a天后,再由甲、乙两工程队合作 天(用含a的式子表示并化简)可完成此项工程;
(3)如果甲工程队施工每天需付施工费1万元,乙工程队施工每天需付施工费2.5万元,甲工程队至少要单独施工多少天后,再由甲、乙两工程队合作施工完成剩下的工程,才能使施工费不超过64万元?




(1)求过A、B、C三点的抛物线的解析式和对称轴;
(2)设点


(3)在抛物线对称轴上,是否存在这样的点M,使得

(4)设点M是直线AC上的动点,试问:在平面直角坐标系中,是否存在位于直线AC下方的点N,使得以点O、A、M、N为顶点的四边形是菱形?若存在,求出点N的坐标;若不存在,说明理由.


(1)求这10个样本数据的平均数、众数和中位数;
(2)根据样本数据,估计小刚所在班50名同学家庭中月均用水量不超过

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【1】题量占比
单选题:(6道)
选择题:(5道)
填空题:(2道)
解答题:(5道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:1
5星难题:0
6星难题:5
7星难题:0
8星难题:2
9星难题:5