阅读理解。 Once there were three old men. They were rather forgetful. They always forgot what they were doing. One of them said, 'I always wonder if I want to buy a coat or a pair of socks.' The second old man said, 'I often forget if I should put something in or take something out of the fridge as soon as I open its door.' 'I am even more forgetful than both of you.' Said the last old man,and he knocked at the table. Then he turned to the other two men and asked,'Who just knocked at the table?' 1. The second old man said _____. A. he forgot where he should go B. he forgot whether he wanted to put something in the fridge C. he forgot his key 2. The first old man forgot _____. A. what he wanted to buy B. where he wanted to go C. what he should bring 3. The third old man said _____. A. he was less forgetful than the others B. he was more forgetful C. he was remembering what he was doing 4. Who is the most forgetful? A. The first old man B. The second old man C. The third old man 5. From the story we can know _____. A. None of them are young B. None of them is forgetful C. The second old man is most forgetful