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In each of the following questions, four sentences are given between the sentences numbered $1$ and $6$. You are required to arrange the four sentences so that all six together make a logical paragraph.

1. For many scientists, oceans are the cradle of life.

A. But all over the world, chemical products and nuclear waste continue to be dumped into them.

B. Coral reefs, which are known as the most beautiful places of the submarine world, are fast disappearing.

C. The result is that many species of fish die because of this pollution.

D. Of course man is the main cause of these problems.

6. Man has long since ruined the places he goes to — continents and oceans alike.

1. ACBD
2. BACD
3. ABDC