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【单选题】
发现系统的访问网址是()A.
www.faxian.com
B.
www.zhizhen.com
C.
www.zhizhen.cn
D.
www.faxian.cn
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反馈参考答案：
举一反三
【单选题】The scientists are studying the effects of human activities______the environment.
A.
in
B.
at
C.
on
D.
with
【单选题】The world's population is getting larger and larger, so the scientists are trying to new ways to solve the food problem. [ ]
A.
devote to
B.
pay for
C.
come up with
D.
catch up with
【单选题】The scientists are able to ____________ accurately when the spaceship will reach the moon.
A.
accumulate
B.
calculate
C.
appoint
D.
estimate
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