回盲瓣
参考答案：
回盲瓣在盲肠与回肠相通处,是回肠末端突入盲肠形成的两个半月形皱襞,有阻止大肠内容物逆流入回肠的作用。
阅读下列句子，写出相关的季节。
1. The weather is warmer and warmer. Trees have new leaves and the flowers bloom.
It's____．
2. The trees lose most of their leaves and the leaves turn yellow, orange and red.
3. It's cold and snowy. Many trees don't have any leaves. Children like to play with snow.
4. It's hot. Trees have green leaves. Children like to swim in the swimming pool.
指出下面句子的修辞手法。
（1）商店和饭馆的门无精打采地敞着。（ ）
（2）就连那手指头也像是一面胜利的旗帜。（ ）
