【練習】

You stare at waterfall for a minute or two, then shift your gaze to its surrounding. What you now see appears to drift upward. You __1

are board a train in a busy station when suddenly another train next __2

to your starts moving forward. __3

For a fraction of a second you feel that your train has lurched backward. These optical illusions occur because the brain is constantly matching its model of reality to signals from the body’s　sensors and interpret what must be happening – that your train __4

might have moved, not the other; that downward motion is now __5

normal, so a change from it must be perceived as upward motion.
The sensors that make this magic are two kinds. __6

Each eye contains about 120 million rods, which provide somewhat blurry black and white vision. These are the windows of night vision; once adapted to the dark, they can detect a candle burnt __7

ten miles away. Colorful vision in each eye comes from six to seven __8

million structures called cones. Under ideal conditions, every cone　can “see” the entire rainbowspectrum of visible colors, but one type of cone is most sensitive to red, another to green, the third to __9

blue. By monitoring how many wavelength of light affects the different cones, a connected ganglion cell can determine its “color” and relay that data brainwork. Rods and cones send their messages pulsing an __10

average 20 to 25 times per second along the optic nerve.

【答案】

1. surrounding－surroundings

surroundings作為名詞總是以復數(shù)形式出現(xiàn)，surrounding是形容詞。

2. board－aboard^board－on

be abroad a train（a ship, a plane…）意思是“在火車（船、飛機）上”。board 是名詞，可以說be on board.

3. you－yours

物主限定詞your不能作介詞的賓語，應該用物主代詞yours。

4. interpret－interpreting

Interpret 通過and 和matching并列，所以也應該是進行時。

5. might－must

根據(jù)上下文，這里必須用表達非常肯定的語氣must，而不是不肯定的“might”，而且，后面的not the other也強調(diào)了非此即彼的肯定性。

6. are^－of

加上介詞of作主語補足語表示對主語的某一種性質(zhì)的描述。

7. burnt－burning

如果用過去分詞burnt修飾candle，那么是說“十英里之外燃盡的蠟燭”，那是不可能用肉眼看到的，所以應該改成burning，表示“在燃燒的蠟燭”。

8. Colorful－Color

Colorful是指所修飾的事物本身具有明亮的或者不同的顏色，而color作定語是指修飾的事物使別的事物的各種顏色能夠展現(xiàn)出來，而不是僅僅看到黑白兩色，比如：color television，color photo，color picture等。

9. the－a

the third 表示順序排列，和the first，the second 對應，“a third”表示數(shù)量上的增加，和one，another相對應。

10. that－those

data這個詞是datum的復數(shù)形式，所以應該用those修飾。

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