单选题：According to the explanation given in the passage, which of

题目内容：

According to the explanation given in the passage, which of the following causes superbubbles to gradually assume the shape of a chimney?

参考答案：

答案解析：

Questions 1—8·Look at the statements below and at the five e

Questions 1—8·Look at the statements below and at the five extracts from an arti

分类：GRE 题型：单选题

There is no doubt__________Herbert is the most industrious student in our class.

分类：GRE 题型：单选题

分类：GRE 题型：单选题

语言要素的变化，有时并非等待社会生活的变革而变化—也就是说，即使社会生活没有发生显著变动，语汇、语音和语法也可能悄悄地起变化，语汇的变化比较显而易见，语法的变化

分类：GRE 题型：单选题

Initially__________ expectation, Stella was dismayed to learn that her new dutie

分类：GRE 题型：单选题