[单项选择]Blinks can take several forms. Besides the blinks that wash the eye, there are those associated with unexpected circumstances (such as loud noises), as well as the voluntary flaps of the eyelids that may express anger or incredulity. Another type, the spontaneous eye blink, is neither voluntary nor reflexive. Most blinks are spontaneous.
Mere eye-rinsing requires a blink no more than once a minute; yet most people blink around 15 times a minute. Why do we blink so frequently Apparently there is a direct relationship between spontaneous blinking and the mind. Scientists can now discern how the frequency and duration of blinks vary according to whether a person is alert, bored, anxious or concentrating.
Studies show first of all that we blink less when we are most alert. A person reading a novel blinks about six times a minute; someone engaged in conversation blinks more than twice as often. Automobile drivers blink less when negotiating distracting city streets than when
A. Once a minute.
B. Once every 4 seconds.
C. Once a tenth of a second.
D. Once a secon

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[单项选择]Blinks can take several forms. Besides the blinks that wash the eye, there are those associated with unexpected circumstances (such as loud noises), as well as the voluntary flaps of the eyelids that may express anger or incredulity. Another type, the spontaneous eye blink, is neither voluntary nor reflexive. Most blinks are spontaneous.
Mere eye-rinsing requires a blink no more than once a minute; yet most people blink around 15 times a minute. Why do we blink so frequently Apparently there is a direct relationship between spontaneous blinking and the mind. Scientists can now discern how the frequency and duration of blinks vary according to whether a person is alert, bored, anxious or concentrating.
Studies show first of all that we blink less when we are most alert. A person reading a novel blinks about six times a minute; someone engaged in conversation blinks more than twice as often. Automobile drivers blink less when negotiating distracting city streets than when
A. Why Anxiety Increases Blinking.
B. Blinking and Apprehension.
C. Spontaneous Blink and Voluntary Blink.
D. Blinking Reflects the Min

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Blinks can take several forms. Besides the blinks that wash the eye, there are those associated with unexpected circumstances (such as loud noises), as well as the voluntary flaps of the eyelids that may express anger or incredulity. Another type, the spontaneous eye blink, is neither voluntary nor reflexive. Most blinks are spontaneous.
Mere eye-rinsing requires a blink no more than once a minute; yet most people blink around 15 times a minute. Why do we blink so frequently Apparently there is a direct relationship between spontaneous blinking and the mind. Scientists can now discern how the frequency and duration of blinks vary according to whether a person is alert, bored, anxious or concentrating.
Studies show first of all that we blink less when we are most alert. A person reading a novel blinks about six times a
A. Once a minute.
B. Once every 4 seconds.
C. Once a tenth of a second.
D. Once a second.

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[单项选择]

There are several different methods that can be used to create a forecast. The method a forecaster chooses depends upon the experience of the forecaster, the amount of information available to the forecaster, the level of difficulty that the forecast situation presents, and the degree of accuracy or confidence needed in the forecast.
The first of these methods is the persistence method; the simplest way of producing a forecast. The persistence method assumes that the conditions at the time of the forecast will not change. For example, if it is sunny and 87 degree today, the persistence method predicts that it will be sunny and 87 degree tomorrow. If two inches of rain fell today, the persistence method would predict two inches of rain for tomorrow. However, if weather conditions change significantly from day to day, the persistence method usually bre
A. (A) Imagination of the forecaster.
B. (C) Necessary amount of information.
C. (B) Practical knowledge of the forecaster.
D. (D) Degree of difficulty involved in forecasting.

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[单项选择]There are several different methods that can be used to create a forecast. The method a forecaster chooses depends upon the experience of the forecaster, the amount of information available to the forecaster, the level of difficulty that the forecast situation presents, and the degree of accuracy or confidence needed in the forecast.
The first of these methods is the persistence method; the simplest way of producing a forecast. The persistence method assumes that the conditions at the time of the forecast will not Change. For example, if it is sunny and 87 degrees today, the persistence method predicts that it will be sunny and 87 degrees tomorrow. If two inches of rain fell today, the persistence method would predict two inches of rain for tomorrow. However, if weather conditions change significantly from day to day, the persistence method usually breaks down and is not the best forecasting method to use.
The trends method involves determining the speed and direction of move
A. Imagination of the forecaster.
B. Necessary amount of information.
C. Practical knowledge of the forecaster.
D. Degree of difficulty involved in forecasting.

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