Ⅶ. 中考趋势 语法填空
根据短文内容，在空格上填入一个适当的单词或括号内单词的正确形式。
新素材 太空养鱼 Fish babies in space! In a space study on zebrafish, Chinese scientists have set a new record. They successfully made four zebrafish live and grow in
a
closed water world.
The zebrafish first
went
（go）to China's space station on the Shenzhou-18 spaceship on April
25, 2024. The four fish grew up and had their babies in a closed fish tank with some plants in 43 days. And one year later, another six zebrafish were sent into space on Shenzhou-20 on April 24.
So
how
did the special closed environment work? In fact, the plants made air for the fish and the fish's waste（排泄物）gave the plants food. The scientists used a special needle（针管）
to feed
（feed）the fish.
Such a closed-loop ecosystem（封闭生态系统）is important for future studies in space. It means that plants and animals can live in space more
simply
（simple）.
The scientists also found that the zebrafish's behaviour（行为）in space was different
from
that on Earth. They often swam on their backs. That's
because
the low gravity（重力）in space made it possible. On Earth, gravity pulls everything to Earth's centre, and animals can find their way easily. Gravity also makes their bodies work
harder
（hard）and become stronger. Considering that
humans
（human）and zebrafish share
70% of the same genes（基因）, the new finding will allow scientists
to understand
（understand）human health better.
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