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信息发布者：
dried food
by the year 2100
the rapid increase in population
It is hoped that...
start (all) over again
large numbers of passengers
with the development of technology
compare with/to...
prevent oneself from floating off into space
carry out
the percentage of students
get ill from living there
if/whether it's worth the risk
start with a discussion
about a survey
after all
the population on the Earth
be aware of/that
be in agreement
the possibility of 
be in no doubt
polluted
rapidly
uncomfortable
specially
electronic
passengers
possibility
Compared
A
D
B
A
D
B
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