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Test 3
Directions: Fill in each blank with a proper word chosen from the box. Each
word can be used only once. Note that there is one word more than you need.
A
A.disadvantage B.notably C. energetic D.insufficient E. alternate
F. evolved G. contribution H. periodic I. withdrawal J. coexist K. adjusted
The degree to which seasonal changes affect mood, energy, sleep, appetite, food preference, or the wish to
socialize with other people has been called seasonality. Seasonal affective disorder (SAD), a condition where
depressions in fall and winter 1 with non-depression periods in spring and summer, is the most marked
form of seasonality.
The typical symptoms of 2 winter depression include lowered mood, social 3 , increased
appetite and weight gain. Mild or no symptoms often occur in spring and summer. It is argued that such pattern of
depression occurrence forms an adaptive mechanism which enhances the likelihood of reproductive success, most
4 for females, among populations living at temperate latitudes(纬度 ). Women are more likely to become
pregnant in the summer and thus to give birth at a time of year when their babies have a higher chance of survival.
Low chance of summer depression also indicates 5 individuals and promotes healthier pregnancies,
which increase the survival chances of both mothers and babies. In the modern era, it is probable that repeated
winter depression is becoming a reproductive 6 .
Several lines of evidence also suggest that genetic factors play an important role in the seasonality and
SAD.Millions of years of evolution had 7 human biochemical systems for survival under
equatorial(赤道的) environmental conditions. Modern humans began to move out of Africa only about 150,000
years ago. Little change in our ‘equatorial’systems might have been expected over this relatively short
evolutionary span. And a genetic defenselessness against