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问题 填空题
“五•一”期间，商业部门对城区4家超市某商品一天的销售量与价格进行随机调查，统计数据如下表．由表中数据算出回归方程y=
̂
b
x+
̂
a
中的
̂
b
=-5，则
̂
a
=______．
售价x（元）1211107
销售量y（件）27324152
答案

由题意，

.
x
=
12+11+10+7
4
=10，
.
y
=
27+32+41+52
4
=38，

将（10，38）代入方程y=-5x+

̂
a
，可得
̂
a
=88，

故答案为：88

填空题

动词填空 用括号内所给动词的适当形式填空，并将答案写在答题卷标有题号的横线上。（本大题共8分，每小题1分）

小题1:The musical video you look forward to _________________(sell) out yesterday.

小题2:At this time yesterday, that woman together with her sons _______________(wait) for his    husband at the station.

小题3:Look! The snow ______________(stop).Let’s go outside to make a snowman.

小题4:Last week they replied to my letter. They said they __________(fly) to see me the next month.

小题5:I don’t know what I should pay attention  ________________(reduce) the pollution.

小题6:When I got to the factory, my workmates ________________(finish) their work.

小题7:Our school _________________(organize) a visit to the park unless it rains tomorrow. 

小题8:When we were young, our teacher told us the earth _____________(travel) around the sun.
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单项选择题

以下哪些物质不属于维生素B族（）

A、核黄素

B、烟碱

C、烟酸

D、泛酸
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