短语讲解：

1. The GAC program is recognized by admissions offices at more than 60 colleges in the United States.

more than 超过; 不只是; 很; 在…次以上
例句：Margaret needed support more than ever.
玛格丽特比以往更需要关心。

2. Officials at several universities contacted by Reuters said they were concerned about the reports of cheating.

concern about 使（自己）关心…
例句：She showed great concern about you.
她很为你担心。
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