皮皮学，免费搜题
登录
搜题
【简答题】
DNA 热变性有何特点? Tm 值表示什么?
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文：Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It catalyzed physical expansion, it sorted out people and land uses, and it accelerated ...
A.
Growth in city area
B.
Separation of commercial and residential areas.
C.
Changes in life in the inner city.
D.
Increased standards of living.
【简答题】What are the three ways in which mass transportation revised the social and economic fabric of the American city? They are the acceleration of______.______and______.
【单选题】The author mentions all of the following as effects of mass transportation on cities EXCEPT.
A.
growth in city area
B.
separation of commercial and residential districts
C.
changes in life in the inner city
D.
increasing standards of living.
【单选题】Mass transportation revised the social and economic, fabric of the American city in many ways so as to permit an easy row of traffic.
A.
texture
B.
textile
C.
network
D.
structure
相关题目：