According to a report by Digital Trends, scientists have solved the long lingering question of how long is a day on Saturn.
This number was reportedly hard to calculate as the gas giant does not have a solid surface. The gas giant can not be tracked as the planet rotates. However, using data from the Cassini spacecraft, NASA scientists have managed to determine that a day on Saturn lasts ten hours, 33 minutes, and 38 seconds.
The newly determined day length is just slightly shorter than previous estimates, such as the 10:39:22 estimation based on 1981 magnetic field data from the Voyager space probe.

   本时文内容由奇速英语国际教育研究院原创编写，未经书面授权，禁止复制和任何商业用途，版权所有，侵权必究！（作者投稿及时文阅读定制请联系微信：400-1000-028）

1.Why is the day length of Saturn hard to calculate?

A The planet is too huge.

B The planet doesn’t have a solid surface.

C The planet is far away from the earth.

D The planet is not in the galaxy.

解析：选B。细节理解题。根据第二段第一句This number was reportedly hard to calculate as the gas giant does not have a solid surface.可知这个数字很难计算是由于这颗气体巨行星没有固体表面，故选B。

2.How long is a day on Saturn according to the new data?

A Twenty-four hours.

B Twelve hours and 30 minutes.

C Ten hours, 38 minutes and 33 seconds.

D Ten hours, 33 minutes and 38 seconds.

解析：选D。细节理解题。根据第二段第三句However, using data from the Cassini spacecraft, NASA scientists have managed to determine that a day on Saturn lasts ten hours, 33 minutes, and 38 seconds.可知利用卡西尼号宇宙飞船的数据，美国宇航局的科学家们成功确定了土星上一天的时长为10小时33分38秒，故选D。

3.How is the newly determined day length when compared to the previous estimates?

A The newly determined day length is longer.

B The newly determined day length is much shorter.

C The newly determined day length is slightly shorter.

D The newly determined day length is the same as the previous estimates.

解析：选C。细节理解题。根据第三段前半句The newly determined day length is just slightly shorter than previous estimates可知新确定的土星日长略短于先前的估计，故选C。

4.When was the previously determined day length 10:39:22 on Saturn get?

A In 1981.

B In 1991.

C In 2008.

D In 2019.

解析：选A。细节理解题。根据第三段后半句such as the 10:39:22 estimation based on 1981 magnetic field data from the Voyager space probe可知先前预估的土星日长10小时39分22秒是根据1981年旅行者号太空探测器的磁场数据得来的，故选A。

5.Where can we probably find the passage?

A In a newspaper.

B In a storybook.

C In a science fiction.

D In a famous recipe.

解析：选A。文章出处题。通读全文可知，文章主要介绍了美国宇航局的科学家揭开土星日长之谜的相关内容，是属于天文学方面的知识，最有可能刊登在报纸上，故选A。