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【单选题】

What can dogs see The answer to this question is disappointing; dogs (67) see no colors. The answer is disappointing (68) many owners of dogs will naturally be sorry that their dogs cannot see colors which to them are beautiful. But then, they may (69) that clogs have an extraordinary (70) sense of smell. The dog’s world is (71) in enjoyable smells, (72) it may be colorless.
How do we know if dogs are color-blind This has been tested in the same way (73) it has been discovered what dogs can hear. The (74) has been made to train dogs to salivate (流口水) when they are shown (75) different colors. Such experiments have (76) failures; it has been found impossible to make dogs (77) colors from one another (78) signals for their dinner. This question requires further (79) with other techniques, but so far as the available scientific evidence (80) , dogs seem to be color-blind.
Monkeys, on the other hand, are able to distinguish colors. They have been trained successfully to (81) their meal to a cupboard, the door of (82) was painted in a certain color, and to (83) other available cupboards with differently colored doors, (84) which there was no food. (85) monkeys and apes, (86) , most mammals seem to be color-blind. Even bulls have been shown not to see red as a color.

A.
go off
B.
go for
C.
go through
D.
go at
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题目标签:流口水
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【单选题】看见杨梅就流口水,是一种( )

A.
无条件反射
B.
操作条件反射
C.
内脏操作条件反射
D.
示范作用
E.
经典条件反射

【单选题】吃酸梅流口水是()。

A.
属于第二信号系统的活动;
B.
无条件反射;
C.
条件反射;
D.
属于第一信号系统的活动

【单选题】对婴儿流口水有良效的穴位是()。

A.
四横纹
B.
小横纹
C.
掌小横纹
D.
肾纹
E.
以上均非

【单选题】A Minor Microsurgery Last year, Sean Martinovich, from Whitianga, had life-saving surgery when a golf-sized tumor was removed from his brain stem. But the operation left haft his face paralysed . He ...

A.
Scan Martinovich couldn"t run around with the other boys in the playground now.
B.
Hopefully, Scan Martinovich can smile over the next three months.
C.
Sean"s patents, Steve and Wendy Martinovich don"t believe the technology will restore the cheeky smile.
D.
For Doctor Bartlett the microsurgery is just a minor and easy case.