What does the passage mainly discuss?
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1 .What is the main idea of the passage?
A Birds are widely studied because they are popular in the home. B Ornithology has made important contributions to biology. C Professional biologists often engage in bird-watching for recreation. D Animal behavior is best studied by observing birds.
2 .Why mice are described in the passage as “creatures of the night” because they are____.
A frightening to many people B hunted by birds C studied while in hibernation D active after dark
3 .Which of the following is NOT mentioned in the first as a reason for popular interest in birds?
A Their ecological value B Their appealing habits C Their visibility D Their beauty
4 .“They” in the second paragraph refers to __________.
A ornithology and general biological science B contributions C professional biologists D birds
5 .David Lack’s research contributed to biological science specifically in the area of ____.
A evolution B mating behavior C animal demography D immunology
7 .According to the passage, the ocean generally has more salt in _____.
A coastal areas B tropical areas C rainy areas D turbulent areas
8 .All of the followings are processes that decrease salinity EXEPT ___.
A evaporation B precipitation C run off D melting
9 .Which of the following statements about the salinity of a body of water can best be inferred from the passage?
A The temperature of the water is the most important factor. B How quickly the water moves is directly related to the amount of salt. C Ocean salinity has little effect on sea life. D Various factors combine to cause variations in the salt content of water.
10 .Why does the author mention the Weddell Sea?
A to show that this body of water has salinity variations B to compare Antarctic waters with Arctic waters C to give an example of cold-water salinity D to point out the location of deep waters
