听长对话，选择正确答案。对话读两遍。 1. What does the woman want to buy? A. A pair of jeans B. A pair of running shoes C. A pair of trousers 2. How much is the black pair? A. 25 dollars B. 45 dollars C. 50 dollars 3. What does the woman think of the black pair? A. Too expensive B. Too small C. OK 4. What color does the woman's son like ? A. White B. Green C. Black 5. Which of these pairs is the cheapest? A .The black pair B. The white pair C. The green pair.