问题
单项选择题
在一艘由上海开往旧金山的海轮上，人们见到的昼夜更替周期是（）
A.一个恒星日
B.一个太阳日
C.比一个太阳日短
D.比一个太阳日长
答案
参考答案：C
解析：
昼夜更替的周期为24小时，即一个太阳日。乙艘由上海开往旧金山的海轮，航行方向与地球自转方向相同，故人们见到的昼夜更替周期比乙太阳日短。
考点：该题考查昼夜更替周期。
搜题请搜索小程序“爱下问搜题”
在一艘由上海开往旧金山的海轮上，人们见到的昼夜更替周期是（）
A.一个恒星日
B.一个太阳日
C.比一个太阳日短
D.比一个太阳日长
参考答案：C
解析：
昼夜更替的周期为24小时，即一个太阳日。乙艘由上海开往旧金山的海轮，航行方向与地球自转方向相同，故人们见到的昼夜更替周期比乙太阳日短。
考点：该题考查昼夜更替周期。
| 根据方框内所给的词的正确词性填空。 | |
2. We were shocked by the _____ made by the mayor that all the gas supplies would be examined. 3. Only ticket-holders will be _____ into the stadium. 4. The government has began to make the _____ into the pollution of the river 5. The actress is so _____ that everyone present paid attention to her. 6. The hotel is right in the _____ of the town and you will not miss it. 7. I fell in love with the book the moment I read it because it is full of _____stories about his childhood. 8. He owes money to a list of people as _____ as your arm. 9. Over 150 _____ will compete in the Indoor Championships at the stadium. 10. Many of the nations of southeast Asia will one day be as _____ as Japan or South Korea. |