[题目]--- When did you buy this computer? It looks so new．--- I it for only a couple of days．My sister bought it for me as a birthday present．A．bought B．have boughtC．have had D．had 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】--- When did you buy this computer? It looks so new．

--- I it for only a couple of days．My sister bought it for me as a birthday present．

A．bought B．have bought

C．have had D．had

【答案】C

【解析】

试题分析：句意：---你什么时候买的这台电脑？它看起来很新。---我买了它只有几天。我姐姐送给我作生日礼物的。根据时间状语for only a couple of days.可知该用现在完成时，并且谓语动词必须是延续性动词，所以选C。

练习册系列答案

暑假作业上海科学技术出版社系列答案

暑假作业内蒙古教育出版社系列答案

暑假最佳学习方案假期总动员白山出版社系列答案

暑假大串联系列答案

欢乐暑假福建教育出版社系列答案

暑假作业译林出版社系列答案

鹰派教辅衔接教材河北教育出版社系列答案

暑假作业快乐假期内蒙古少年儿童出版社系列答案

假期生活暑假河北人民出版社系列答案

初中暑期衔接系列答案

相关题目

【题目】

Art, as we know, is subjective. What one person considers a priceless masterpiece others might see as nothing more than a giant black square. But there’s one very specific kind of painting that almost everyone sees the same way — the kind with the “strange” eyes that seem to follow you around the room. So what causes this optical illusion (视觉错觉) and how do artists achieve this effect?

It turns out, for even a moderately skilled artist, this effect isn’t a difficult thing to achieve. In fact, the artists need to use a little illusion of depth, making the person depicted on the canvas appears somewhat 3D on a 2D canvas, and to adjust the gaze (凝视) of the eyes so that they would be looking at someone standing right in front of the picture.

So what exactly is going on here in our brains that then makes it seem like the eyes follow you even if you move away from being front and center? As demonstrated by a team of researchers from Ohio State University, as you move to the side, the “near” and “far” points of the 2D image don’t really change. These near and far points are defined as visible points that, if the image was 3D, would appear nearest and furthest away from the viewer at a given angle.

The idea is simple. No matter what angle you look at a painting from, the painting itself doesn’t change. You’re looking at a flat surface. The key is that the near points and far points of the picture remained the same no matter the angle the picture was viewed from. When observing real surfaces in the natural environment, the near and far points vary when we change viewing direction. When we observe a picture on the wall, the visual information that defines near and far points is unaffected by viewing direction. Still, we willingly accept and interpret the thing in the painting as if it were a real object.

Thus, because the perspective, shadows, and light on the painting don’t change as you move around, if the eyes in the painting would be staring directly at the observer who is standing in front of the painting, it creates something of an optical illusion in your brain so that the eyes will continue to seem to stare at you as you move to the side.

In contrast to the eyes following you trick, if the artist tweaks the painting a bit, for example the artist adjusts the gaze of the eyes so that the eyes are looking off somewhere else instead of directly looking at a potential observer, no matter where you stand, the eyes will never seem to be looking at you.

The technique first began popularly showing up in art around the 14th century when the artist and architect Fillipo Brunelleshi introduced the art world to the idea of “linear perspective”, being painting with the idea of everything in the picture converging (聚集) on a specific point on the horizon, creating the illusion of depth. Linear perspective, combined with skilled use of light and shadow allows artists to create masterfully realistic paintings, including sometimes of people that stare at you creepily no matter where you stand.

【1】What’s the writer’s purpose of writing Paragraph 1?

A.To lead in the question why staring eyes seem to follow us in a painting.

B.To make a comparison between a priceless masterpiece and a black square.

C.To introduce the topic that the optical illusion can make the painting look real.

D.To prove that people can think alike when they admire a certain kind of painting.

【2】What can't we learn from the passage?

A.The visible points of the image won’t change in the natural environment.

B.The near and far points of a painting are affected by our viewing direction.

C.The viewing direction of viewers can make the image in the painting look real.

D.The optical illusion in our brain makes us feel the eyes in the painting staring at us.

【3】The 3rd paragraph is mainly about ________.

A.who took part in the research.