正确答案: B
以人类为研究主体
题目:当代环境问题和资源问题,使生态学的研究日益从以生物为研究主体发展到( )
解析:B
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学习资料的答案和解析:
[单选题]IV. Reading Comprehension (60 points)Directions: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A, B, C and D. Choose one best answer and blacken the corresponding letter on the Answer Sheet.
bird flu
解析: 36.答案为C 此题考查主题思想判断。注意文章中的第1段和最后一段,发现有wild
and farm birds often get a flu virus,the best way to stop the spread of bird flu,注意下划线部分。主题思想一般位
于文章的第1段或最后一段,故选C为答案。