A. the increase of population B. the limited energy resources C. the more serious air pollution D. the development of technology 参考答案:A 答案解析:[解析] 细节题。根据文章中第一句Our environment is getting worse and worse with the increase of the world populatio
第27题: [单项选择]新生儿时期大脑的重量约为() A. 200g B. 250g C. 370g D. 450g E. 500g 参考答案:C 答案解析:小儿出生时大脑的重量为300~400g,大脑的脑沟回较浅且发育不完善。