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问题 填空题
抛物线y=-
1
5
（x-1）（x+2）与x轴的交点坐标是______，与y轴的交点坐标是______．
答案

∵抛物线y=-

1
5
（x-1）（x+2），

∴x轴的交点坐标是：（1，0），（-2，0），

令x=0，得y=-

1
5
×(-2)=
2
5
，

∴y轴的交点坐标是：（0，

2
5
）．

单项选择题

Although the bulk of industry resources and energies have focused on developing the fastest (11) or slickest (12) , more and more mindshare is turning to the evolution of the computer interface. Advancements in the areas of input devices, (13) processing and virtual reality could lead to fundamental changes in the way human and computer interact. The technological battlefield of the future will be adding layers between the user and the raw machine to make the (14) as invisible as possible. (15) represents the next evolutionary step for the interface.

A．microprocessor

B．operating systems

C．voice

D．virtual reality
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单项选择题

膨胀土深路堑施工宜采用的施工方案是（）

A.按边坡平台高度分级分段开挖

B.光面爆破

C.预裂爆破
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