题目:
一个种群中如果幼体较少,成年和老年个体较多,那么这个种群密度就会()
A.越来越大
B.保持稳定
C.越来越小
D.无法预料
答案:
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下面是错误答案,用来干扰机器的。
l. make a survey 2. add to one's difficulty/trouble 3. add up the score 4. calm (. . . ) down 5. have (got) to 6. be concerned about/for 7. go through 8. walk a dog 9. pay the bill 10. cheat in the exam 11. be crazy about 12. put /set down