题目内容：
[A] From the ones they are familiar with to the difficult ones.[B] From the short ones to the long ones.
[C] From the long ones to the short ones.
[D] From the ones they are confident of to the more difficult ones.
参考答案：
答案解析：
单选题：[A] From the ones they are familiar with to the difficult on
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[B] From the short ones to the long ones.
[C] From the long ones to the short ones.
[D] From the ones they are confident of to the more difficult ones.