Read the following two passages and choose the correct answer for each question.
Various types of fog are essentially clouds that form at the earth's surface, produced by temperature differences and moisture in the air. As warm, moisture-laden air cools, its relative humidity (the amount of moisture that air can contain, which depends on the temperature) increases. Warm air can hold more water vapor than cold air. So if the air is cooled sufficiently it will reach saturation, or the dew point, at which point the moisture begins to condense out of the air and form water droplets, creating fog.
It can be concluded from the passage that ...... .
A.
foggy days are caused by cold nights
B.fog is likely to form in desert areas
C.
hot humid days are usually followed by cold, foggy nights
D.
fog could form on a cold evening after a warm day
Various types of fog are essentially clouds that form at the earth's surface, produced by temperature differences and moisture in the air. As warm, moisture-laden air cools, its relative humidity (the amount of moisture that air can contain, which depends on the temperature) increases. Warm air can hold more water vapor than cold air. So if the air is cooled sufficiently it will reach saturation, or the dew point, at which point the moisture begins to condense out of the air and form water droplets, creating fog.
It can be concluded from the passage that ...... .
A.
foggy days are caused by cold nights
B.fog is likely to form in desert areas
C.
hot humid days are usually followed by cold, foggy nights
D.
fog could form on a cold evening after a warm day
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