15 According to the passage, which of the following is true?
(A) Cultures are not the only reason behind the seven-day week.
(B) The former Soviet Union experimented a eight-day week.
(C) It needs about two weeks for the body to fight off a cold.
(D) Most people would like to change the length of a week.

Having a seven-day week seemed strange to sociologists since there was no corresponding相似的；相應 geophysical地球物理学 event（尤指重大或不尋常的）事情，事件 as there was with the solar day or the lunar month.

They tended to趋向于 attribute特質；屬性 it to our cultures and not to biology.

However, other organisms生物體；有機體；微生物 also have a seven-day cycle, and a week is, after all, a quarter四分之一 of a lunar circle.

At the end of在…盡頭… the French Revolution, the revolutionary革命的，革命性的 government wanted to establish a ten-day week, but the attempt（尤指為完成難事而進行）努力，嘗試 failed to work.

In the former Soviet Union蘇維埃社會主義共和國聯盟, the rulers also experimented實驗 with modifying改變, （稍作）修改 the week by trying five-day and six-day weeks.

Again, people rejected拒絕接受 to change the length of their week.

They seemed似乎（seem的過去式） to need to have one day out of seven in order to rest their body clocks.

Weekly rhythms節奏 show up most strongly during times of stress.

For the body to fight off抵抗 a cold, it needs about a week.

The symptoms of chicken pox水痘 show up about two weeks after the patient’s being exposed暴露；露出 to disease.

Health care workers expect盼望 to see patients with pneumonia肺炎 and malaria瘧疾 at greatest risk after one week of fighting these diseases.

By these evidences, sociologists have had reasons to reconsider重新考慮；重新審議 their previous ideas about the origin of the seven-day week.

根據該段落，以下哪項是真的？

（A）文化並不是七天工作週背後的唯一原因。

（B）前蘇聯試驗了為期八天的一周。

（C）身體需要大約兩週的時間才能抵禦感冒。

（D）大多數人想改變一周的長度。