单项选择题

The author wants to tell us in Para 1-4_____.

A．DNA's functions
B．DNA's applications
C．DNA's research
D．DNA's techniques
<上一题 目录 下一题>
热门 试题

单项选择题
What does the author want to tell us in Para 4 to Para 9
A．New technology used in public transportation.
B．The future trends in public transportation.
C．The automation through new technology.
D．Advanced transit concepts
单项选择题
If you have physical handicaps, what kind of transit system can you use
A．Conventional transportation services.
B．Public transportation.
C．Suspended monorails.
D．All transit services which are accessible to the disabled.
相关试题