中国大学MOOC: Since a common device in closing is the use of rhetorical questions, summation should ask questions.

Since a common device in closing is the use of rhetorical questions, summation should ask questions. A: 正确 B: 错误

雨课堂: 语法判断 To start with, according to Lemma 2, the number of saved candidate nodes at each searching layer is upper bounded by the summation of searching sizes at the previous layer.