A. Choose a, b, c, or d for the correct answer.

The following text is for questions 1-5.

    A rabbit can run very fast. A tortoise moves very slowly. It carries a heavy shell on his back. It can move as fast as the other animals.

    One morning a rabbit said to a tortoise, "I can run very fast. You are a very slow animal.

    ''Yes," said the tortoise. "I cannot run as fast as you. But let us have a race. I will race you and I will win. I will beat you."

    "You are foolish," said the rabbit, "I will beat you easily. Let us race to that tree. Are you ready? Go!"

    The tortoise began walking slowly towards the tree. He couldn't go fast. But he did not stop. The rabbit laughed.

    "I shall no hurry." He said. I shall lie down to have a little rest. Then I shall go after the tortoise and win the race. I can run faster than the tortoise."

    The rabbit laid down and went asleep. The tortoise moved slowly on. The sun climbed higher into the sky. The tortoise moved nearer to the tree but the rabbit was asleep.

    At last the rabbit woke up. "Now I shall run to the tree and win the race," he said. He ran quickly to the tree but the tortoise was there.

    "I am slow," said the tortoise, "but I won the race."

He ran quickly to the tree but the tortoise was there."

The underlined word refers to ....