问题
名词解释
气孔
答案
参考答案：
指地钱目叶状体的气室向外开口处，叫气孔，是气体出入的通道。此种气孔与种子植物的气孔器不同，它由16个细胞组成烟囱状，不开闭。
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气孔
参考答案：
指地钱目叶状体的气室向外开口处，叫气孔，是气体出入的通道。此种气孔与种子植物的气孔器不同，它由16个细胞组成烟囱状，不开闭。
用方框内所给词语的适当形式填空，使文章通顺、完整。（每词限用一次）
A French driver says, “One day, man will travel in the sea _________小题3:they do in the street!” If humans want to live in the sea, they have to solve (解决) a lot of ___小题4: first. For example, what will happen to our body if we stay in the water _________小题5: a long time? Scientists are _________小题6: for the answers. Maybe in 50 years man will be _________小题7: to live in the sea. They will be away from the _________小题8: cities. Man will _________小题9:that it’s fun and interesting to live in the sea, and that life in the sea is more _________小题10:. Don’t you think so? |