根据题目要求完成下列任务。用中文作答。
下面是某初中课堂教学片段。
T: (referring to a picture) where is John, Li Lei?
S 1: He has gone to Shanghai.
T: How many times has he been to Shanghai?
S 1: He has been to Shanghaifor only once.
T: (referring to another picture) where is Mary, Wang Wei?
S2: She has gone to the library.
T: How many times has she been to the library a week?
S2: She has been to the library twice a week.
根据上面所提供的信息，从下面四个方面作答：
(1)此教学片段的教学目标是什么?(5分)
(2)教师采用了何种教学方法?(5分)
(3)该教学方法有何优缺点?(10分)
(4)提出两条主要建议，解决该教学方法可能带来的问题。(10分)