根据短文内容，从短文后的选项中选出适当的选项补全短文，并将选项的编号字母依次填入题号后横线上。
    A recent survey has shown that China is considered to be (he most indusuious nation in the world,____ .
    The survey 一with more than 8,000 people surveyed from Canada. France, Germany, India, Netherlands, the UK and the US—ranks their 'industriousness(勤奋度),which describes (he level to which a country is “hard—working, creative in producing new ideas or products”.
According to the international survey,____ , followed by workers from Germany and the US. Employees from a France are considered 10 be the laziest people in the world. German employees replied confidently to the survey, placing themselves first in the order of global industriousness French employees, on the other hand, seem to know (heir limitations (能力局限)____ .
A Germany newspaper reported that Chinese employees work on average 44.6 hours per work, ____ .
____ , Chinese employees have only ten days of paid leave on average, while German employees have twenty—five days. Industriousness Ranking: China, Germany, the US, Canada, India, the UK, Netherland, France.

E.while German employees average about 33.5hours of work per week
F.according to the research from Monster Worldwide and GFK,a German global market research institute.

△ABC外接圆的半径为1，圆心为O，且2$\overrightarrow{OA}$+$\overrightarrow{AB}$+$\overrightarrow{AC}$=$\overrightarrow{0}$，|$\overrightarrow{OA}$|=|$\overrightarrow{AB}$|，则$\overrightarrow{CA}$•$\overrightarrow{CB}$等于（　　）