单项选择题

According to the author, the main problem of our environment today is ______.

A．the increase of population
B．the limited energy resources
C．the more serious air pollution
D．the development of technology
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单项选择题
The author's main purpose in writing this passage is most probably to______.
A．complain about people's slow actions to protect the environment
B．advise people to take actions to protect the environment
C．show himself to be an active environment protector
D．point out the bad effects of technology in protecting environment
单项选择题
All of the following are the first in the life of Elizabeth Blackwell, except that ______.
A．she became the first female physician
B．she was the first woman surgeon
C．she founded the first hospital for women and children
D．she established the first medical school for women
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