题目内容
种群密度的变化影响种内竞争，使出生率、死亡率等种群参数变化，这样的种群调节方式是______。
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林带可以使冬季的积雪免于被风吹走，因而保持了地温。( )
Section ADirections: This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the centre.
法律由国家制定或认可，并由国家强制力保证实施的，反映着统治阶级意志的规范体系。( )
随着海拔升高积温不断减少，因此农作物在不同的海拔高度的分布有一定的限制。( )
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