在城市道路设计中，下列哪一种情况下可以不设置竖曲线( )A．相邻坡段坡度差小于0.5

阅读理解。

     We have always been interested in the moon. 2000 years ago people already knew it moved around the

earth and where it would be in the sky at different times of the year. At that time, everything about the moon

was learned by watching it carefully in the sky. 　　

     When scientists could use telescopes to study the moon more closely, their ideas began to change. They

could see the moon was made of rocks. Most scientists thought moon rocks would be different from those

on Earth. This was because they believed the moon had once been a planet that had been caught in the earth's

gravity (引力) millions of years earlier. 　　

     In 1969 moon rocks were finally brought to the earth and studied. Much to their surprise, scientists found

that, except for water, the moon and the earth were made of the same things. Once again new ideas were

needed for this new information. 　　

     After years of study, most scientists now think that the moon was once part of Earth. They believe very

early in its history, maybe 4 million years ago, something about the size of Mars hit Earth. This sent billions

of rocks into space around our planet. These rocks slowly joined together and after many years became the

moon. In the future, even though our ideas about the moon may change again, we will still be interested in it.

1. What does the writer want to tell us in the passage?

A. Why people are interested in the moon.

B. How ideas about the moon have changed over time.

C. Where the moon came from in the past.

D. That people have finally learned the truth about the moon.

2. Before 1969 most scientists thought the moon was _____.

A. part of the earth billions of years earlier

B. older than the earth

C. a planet caught by the earth's gravity

D. made of the same things as the earth

3. From this passage we can learn that _____.

A. scientists in the past were not clever

B. the earth was once part of the moon

C. new information brings new ideas

D. we now know everything about the moon

若复数z=（x﹣5）+（3﹣x）i在复平面内对应的点位于第三象限，则实数x的取值范围是[ ]

A．（﹣∞，5）　　

B．（5，+∞）　　

C．（3，+∞）　　

D．（3，5）

系统压力主要是由（）的大小来调节的

《证券发行与承销管理办法》重点规范了首次公开发行股票的询价、定价以及股票配售等环节，完善了现行的询价制度。

取血后如果全血在室温下放置，血糖浓度每小时可下降多少（）

A.5%-7%

B.5%～10%

C.10%～15%

D.1%～7%

E.5%～15%