阅读下面的短文，并做每篇后面的题目。从四个选项中选出能回答所提问题或完成所给句子的最佳答案。
One day, Allan and his friend Henry went swimming in a river. It was very hot. How happy they were in the river! After they got out of the water, they played games in the sun for a while.
On their way back, Henry saw some flowers. He liked flowers very much and ran into the green field to look at them. Now Allan was walking by himself.
Then he heard Henry calling out, "A snake（蛇）! Help!..."
"What's wrong with you?" asked Allan.
"A snake bit（咬）me in the leg. Come here!"
Allan ran over and saw a small red wound（伤口）on Henry' s leg.
