单选题：Data from Voyager II have presented astronomers with a puzzl

题目内容：

Data from Voyager II have presented astronomers with a puzzle about why our outermost planet exists. A．problem
B．mystery
C．question
D．point

参考答案：

答案解析：

In 1861 it seemed inevitable that the Southern states would

In 1861 it seemed inevitable that the Southern states would break away from the

分类：综合类题型：单选题

Before you decide on a vocation, it might be a good idea to consult a few good

分类：综合类题型：单选题

It is postulated that population trends have an effect on economic fluctuations

分类：综合类题型：单选题

背景资料：某教学楼工程，建筑面积12000㎡，框架结构，地上4层，檐高18m，施工单位中标后进场施工，施工过程中发生了如下事件：事件一：甲方将规划批准的、测绘院

分类：综合类题型：单选题

The police will need to keep a wary eye on this area of town.A．naked B．cautious

分类：综合类题型：单选题