所谓建筑环境学就是指在建筑空间内,在满足使用功能的前提下,如何让人们在使用过程中感到()的一门科学。
参考答案:舒适和健康
— I rang you at about nine, but there was no reply.
— Oh, that was probably________I was seeing the doctor. [ ]
A. why
B. when
C. what
D. that
DNA和RNA的结构单体是()。