What can be inferred from Para. 2?
A．There is a universal agreement on the safety level for the amount of Vitamin D intake.
B．Few researches on the amount of Vitamin D intake have been carried out.
C．Vitamin D belongs to the category of hormone.
D．Vitamin D is only useful for retaining the bone.

未分类题Which of the following descriptions about the amount of Vitamin D intake is true?A．The upper limit of Vitamin D intake for adults is 400 lUs.B．It is dangerous for adults to take 2,000 lUs Vitamin D daily.C．An overdose of Vitamin D does not necessarily result in diseases.D．For people under 50, it is safe to take 200 lUs Vitamin D daily.

判断题施工图预算一般由设计单位编制。()

未分类题The drug companies are willing to pay leading doctors toA．manipulate medical education sessions.B．improve the individual health-care service.C．have personal contact with physicians.D．help promote the drugs they produce.

判断题若公司相信外部借款所产生的利润增值可以弥补利息费用，那么由该借款引起的财务杠杆升高就是有价值的。()

未分类题It can be inferred from the passage that ______.A．war is one of the main causes of PTSDB．extinction therapy involves moral issuesC．Gogolla often writes for the journal ScienceD．fearful memories will recover spontaneously