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【单选题】
设正项等比数列 ， 成等差数列，公差 ，且 的前三项和为 ，则 的通A.
B.
C.
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举一反三
【单选题】Please choose the right description about the language of two.
A.
The Language of Two is to provide the sense of whole.
B.
The language of Two is to divide the world.
C.
The language of Two is to denote the single-mindedness.
D.
The Language of Two is to list, compile and expand.
【单选题】Please choose the right description about the language of two.
A.
The Language of Two is to provide the sense of whole.
B.
The Language of Two is to divide the world.
C.
The Language of Two is to denote the single-mindedness.
D.
The Language of Two is to list, compile and expand.
【简答题】眼睛的( )相当于光屏,近视眼用( )来矫正,远视眼用( )矫正。
【单选题】如图所示为近视眼和远视眼的成像光路图， 以下说法正确的是 [ ]
A.
图甲为近视眼，应用凹透镜来矫正
B.
图甲为远视眼，应用凸透镜来矫正
C.
图乙为近视眼，应用凸透镜来矫正
D.
图乙为远视眼，应用凹透镜来矫正
【简答题】混凝土应具有一定得抗渗性、抗冻性、抗侵蚀性、抗冲耐磨性、抗风化性、抗碳化性等，统称为混凝土（）。
【单选题】下列关于近视眼及其矫正的阐述，正确的是（ ）
A.
他的眼睛从晶状体到视网膜的长度大于平均值
B.
应用一个合适的双凸镜来矫正此缺陷
C.
近视比远视受到更严重的影响
D.
一个圆形的物体看起来像是椭圆形的
【单选题】Computer language has only two letters, what are they? ( )
A.
zeros and eights
B.
ones and nines
C.
zeros and ones
D.
ones and eights
【简答题】A．It was pretty good. B．It was rather dull. C．It was not well organized. D．It was attended by many people.
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