题目内容

By the time I ____________, I realized that I had left my umbrella in the shop.

A. arrived at home B. reach home C. got to home D. arrived home

 

D

【解析】

试题分析：句意：当我到家的时候我意识到我把我的雨伞落在商店了，By the time引导，并且主要用于过去完成时从句（by the time +过去式），主句（主语+过去完成时）到家应是arrive home= reach home=get home,根据时态故选C。

考点：考查动词时态。

 

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Everything that humans hear is in the form of waves(波). Just as the eye sees light waves in the form of colors, the ear hears sound waves in the form of noises. The ear and the eye turn these different waves into signals that the brain(大脑) can make sense of.

The ears and brain have an amazing ability to recognize(识别) particular sounds. For example, a mother often can tell when her baby is crying even if there are other crying babies in the same room. This is because the sound of her baby’s cry has special meaning to her and the brain has recorded its importance.

The ability to recognize sounds improves with experiences. As the brain receives information about sounds from day to day, it stores the information in its memory. When the brain hears new sounds, it gives meaning to them based on the information already in the memory. This is why certain words or songs can make a person happy. Often it is not the words or songs themselves that cause this feeling. The sounds are connected to happy memories for that person.

Another hearing process controlled by the brain is to decide where a sound is coming from. One ear is usually closer to the source(来源) of a sound than the other ear is. Sound waves are stronger when they reach the ear that is closer. They also reach the closer ear first. The brain recognizes these differences and uses them to decide the location of the source of the sound.

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a. The ears receive the sound waves.

b. The mother recognizes her baby’s cry.

c. The baby’s turn the sound waves into signals.

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B. Because a person has the ability to recognize the sounds

C. Because the certain sounds are connected to happy memories for that person.

D. Because the person feel the song is special

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