1.单选题- (共5题)
①向左平移,再将横坐标变为原来的; ②横坐标变为原来的,再向左平移;③横坐标变为原来的,再向左平移; ④向左平移,再将横坐标变为原来的;其中能将正弦曲线的图像变为的图像的是 ( )
A.①和② | B.①和③ | C.②和③ | D.②和④ |

x | 2 | 3 | 4 | 5 | 6 |
y | 2.2 | 3.8 | t | 6.5 | 7.0 |
A.5.5 | B.5.0 | C.4.5 | D.4.8 |
2.选择题- (共5题)
Li Lin{#blank#}1{#/blank#}(be) a student of Class 6,Grade 7. He often {#blank#}2{#/blank#} (乘公汽)school. The class {#blank#}3{#/blank#}(开始)at 8:00a.m. He {#blank#}4{#/blank#} Chinese, English, politics and some other subjects. He{#blank#}5{#/blank#} (不喜欢) geography at all. After school. He likes to{#blank#}6{#/blank#}basketball with classmates every Tuesday.
Look! He{#blank#}7{#/blank#}(have)a P.E. class now . Some students{#blank#}8{#/blank#}(游泳)in the pool. A few students{#blank#}9{#/blank#} (看报) over there.
Five of them {#blank#}10{#/blank#}(进行篮球比赛) . Many students {#blank#}11{#/blank#}(放风筝). But he {#blank#}12{#/blank#}(唱歌)under the tree. I think his school life is very interesting.
3.填空题- (共1题)
4.解答题- (共2题)






(1)若成绩小于14秒认为优秀,求该样本在这次百米测试中成绩优秀的人数;
(2)请估计学校900名学生中,成绩属于第四组的人数;
(3)请根据频率分布直方图,求样本数据的众数和中位数(保留两位小数).
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【1】题量占比
单选题:(5道)
选择题:(5道)
填空题:(1道)
解答题:(2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:0
5星难题:0
6星难题:0
7星难题:0
8星难题:0
9星难题:8