Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. Mark Twain became well known by_____

Rat the Cleverest

The Largest Grain Eater

Our Most Dangerous Enemy the Rat

The Dangerous Diseases Carrier

产妇应侧卧，不宜站立走动

少做肛查

注意胎心变化

若宫缩乏勺，产程进展停滞，应放宽剖宫产指征

宫口开大3cm时，行人工破膜

正确

错误

As one works with color in a practical, or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile, changeable thing (1) to a large extent on the relationship of the color (2) other colors (3) simultaneously. It is not (4) in its relation to the direct stimulus which (5) it. On the other hand, the properties of surfaces that give (6) to color do not seem to change greatly under a wide variety of illumination color, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to be (7) in large part to the mechanism of color (8) .

When the eye is (9) to a colored area, there is an immediate readjustment of the (10) of the eye to color in and around the area (11) . This readjustment does not promptly affect the color seen but usually does affect the next area to which the (12) is shifted. The longer the time of viewing, the higher the (13) , and the larger the area, the greater the effect will be (14) its persistence in the (15) viewing situation. As indicated by the work of Wright and Schouten, it appears that, at (16) for a first approximation, full adaptation takes place over (17) time if the adapting source is moderately bright and the eye has been in (18) darkness just previously. Also, (19) of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become (20) over the whole eye.

So what is depression Depression is often more about anger turned (1) than it is about sadness. But it’s usually (2) as sadness. Depression can (3) at all ages, from childhood to old age, and it’s the United States’ No. 1 (4) problem.

When someone is depressed, her behavior (5) change and she loses interest in activities she (6) enjoyed (like sports, music, friendships). The sadness usually lasts every day for most of the day and for two weeks or more.

What (7) depression A (8) event can certainly bring (9) depression, but some will say it happens (10) a specific cause. So how do you know if you’re just having a bad day (11) are really depressed Depression affects your (12) , moods, behavior and even your physical health. These changes often go (13) or are labeled (14) simply a bad case of the blues.

Someone who’s truly (15) depression will have (16) periods of crying spells, feelings of (17) (like not being able to change your situation) and (18) (like you’ll feel this way forever), irritation or agitation. A depressed person often (19) from others. Depression seldom goes away by itself, and the greatest (20) of depression is suicide. The risk of suicide increases if the depression isn’t treated.

Rat the Cleverest

The Largest Grain Eater

Our Most Dangerous Enemy the Rat

The Dangerous Diseases Carrier

产妇应侧卧，不宜站立走动

少做肛查

注意胎心变化

若宫缩乏勺，产程进展停滞，应放宽剖宫产指征

宫口开大3cm时，行人工破膜

正确

错误

As one works with color in a practical, or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile, changeable thing (1) to a large extent on the relationship of the color (2) other colors (3) simultaneously. It is not (4) in its relation to the direct stimulus which (5) it. On the other hand, the properties of surfaces that give (6) to color do not seem to change greatly under a wide variety of illumination color, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to be (7) in large part to the mechanism of color (8) .

When the eye is (9) to a colored area, there is an immediate readjustment of the (10) of the eye to color in and around the area (11) . This readjustment does not promptly affect the color seen but usually does affect the next area to which the (12) is shifted. The longer the time of viewing, the higher the (13) , and the larger the area, the greater the effect will be (14) its persistence in the (15) viewing situation. As indicated by the work of Wright and Schouten, it appears that, at (16) for a first approximation, full adaptation takes place over (17) time if the adapting source is moderately bright and the eye has been in (18) darkness just previously. Also, (19) of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become (20) over the whole eye.

So what is depression Depression is often more about anger turned (1) than it is about sadness. But it’s usually (2) as sadness. Depression can (3) at all ages, from childhood to old age, and it’s the United States’ No. 1 (4) problem.

When someone is depressed, her behavior (5) change and she loses interest in activities she (6) enjoyed (like sports, music, friendships). The sadness usually lasts every day for most of the day and for two weeks or more.

What (7) depression A (8) event can certainly bring (9) depression, but some will say it happens (10) a specific cause. So how do you know if you’re just having a bad day (11) are really depressed Depression affects your (12) , moods, behavior and even your physical health. These changes often go (13) or are labeled (14) simply a bad case of the blues.

Someone who’s truly (15) depression will have (16) periods of crying spells, feelings of (17) (like not being able to change your situation) and (18) (like you’ll feel this way forever), irritation or agitation. A depressed person often (19) from others. Depression seldom goes away by itself, and the greatest (20) of depression is suicide. The risk of suicide increases if the depression isn’t treated.