Can Dogs See Colors?Man's best friend is colorblind (色盲). Fortun

Can Dogs See Colors?

Man's best friend is colorblind (色盲). Fortunately (fortunate), his （41）_____(survive) does not depend upon the ability to see colors. The （42）_____ (sharp) of his sense of smell makes up for his（43） _____ (fail) to see colors. It helps him to tell between things.

（44）_____ (study) support the conclusion that dogs live in a （45）_____ (color) world. The testing done primarily （46）_____ (focus) on the dogs' responses to colors for food. Dogs could not tell the （47）_____ (differ)between one color signal for food, and other colors that were not for food.

Most animals' lack of ability to see colors can be （48）_____ (easy) understood. Many colorblind animals hunt for food in the dark of night. Their other senses have highly （49）_____(develop). Thus their lack of color vision does not affect them.

Other animals with color vision are （50）_____ (monkey) and apes(猿). Both can be trained to open a colored door, behind which is food.


【正确答案】：1. survival

2. sharpness

3. failure/failing

4. studies

5. colorless

6. focused

7. difference

8. easily

9. developed

10. monkeys


【题目解析】：1. 由空前的形容词性物主代词his可知，空格处需要一个名词，故为survival。

2.  由空前的定冠词the和空后的of可知，空格处需要一个名词，故为sharpness，意思为狗敏锐的嗅觉弥补了其色盲这以弱点（失败之处）。

3. 由空前的形容词性物主代词可知，空格处需要一个名词，故为failure。

4. 由空后的谓语动词可知，主语不是第三人称单数，故为study的复数形式，答案为studies。

5. 由空前的不定冠词a和空后的名词world可知，空格处需要一个形容词修饰后面的名词，再根据文后的研究结果提到，狗不能区分食物中的颜色和其他不是食物的颜色，由此可知，狗是生活在一个无色的世界里。

6. 分析句子成分可知，空格处缺少谓语动词，该句的主语为第三人称单数，故为focuses。

7. 由空前的定冠词the可知，空格处需要一个名词，故为difference。

8. 由空前的can be和空后的understood可知，该句的主谓成分完整，由此可知，空格处缺少一个副词来修饰空后的动词，故为easily。

9. 由空前的have和副词highly可知，空格出需要一个完成时态，have done构成现在完成时，故为developed。

10. 由空前修饰复数的系动词are和空后and连接的复数名词apes可知，空格处需要一个名词复数，以元音字母加-y结尾的名词复数变形，直接在词尾后加-s。故为monkeys。