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   On a summer day, a man sitting under a tree on the bank of a river, watched a group of ducks on the river.

Soon a branch（树枝）with leaves came drifting（漂浮）among them, and they all flew away. After circling in the air for a little time, they landed again on their feeding ground.

Soon another branch came drifting down among them, and again they took flight from the river. But when they found the branch had drifted by without any danger, they flew down to the water as before.

After four or five branches had drifted by in this way, the ducks gave little attention to them. At last, they hardly tried to fly out of their way, even when the branches nearly touched them.

The man who was watching all this, now wanted to know who had drifted these branches. He looked up the river, and noticed a fox slyly（偷偷地）watching the ducks. “What will he do next?” thought the man.

When the fox saw that the ducks were no longer afraid of the branches, he took a much larger branch, and hid himself behind it. Then he drifted himself with the larger branch. When he was right among the ducks, he caught two young ducks quickly and swam off with them. The rest of the ducks flew away in fright（惊吓）, and did not come back for a long time.

The fox must have enjoyed a fine dinner for what he had done.

根据短文内容，选择最佳答案。
1．What did the man watch on the river at first?

A．Ducks.

B．Foxes.

C．Leaves.

D．Branches.

2．What did the ducks do as soon as the first branch came near them?

A．They fed themselves.	B．They stayed still.
C．They looked for food.	D．They flew away.

3．At last, even when the branches nearly touched the ducks, they ________ .

A．tried to fly at once	B．swam off quickly
C．were no longer afraid	D．came back for a long time

4．Why did the fox drift the larger branch?

A．To have fun.	B．To catch the ducks.
C．To cross the river.	D．To swim with ducks.

5．What do you think of the fox?

A．Clever and patient.	B．Kind and thankful.
C．Interesting and outgoing.	D．Lovely and friendly.