【单选题】The Mayan calendar far more accurate than the European calendars of the time most probably because ______.
A.
the Mayan numbers enabled the Mayan priests to study planets
B.
the European countries had no interest in founding a calendar
C.
the European calendars of the time probably were made by a guess work
D.
the year was divided into 18 months of 20 days each with five days left over
【单选题】This article is mainly about ______.
A.
the Mayan calendar and the ancient Mayan buildings
B.
the Mayan Indians and the Mayan calendar
C.
the intelligent Maya and their many achievements
D.
the ancient Mayan cities and temples
【单选题】What can be inferred about the Mayan culture?
A.
Mayan civilization began to decline around 900 AD.
B.
Historians are not sure about the reason for the decline.
C.
The study of Mayan civilization has become very popular now.
D.
Mayan civilization will flourish again in the future.
【单选题】. NET 语言不包括以下哪种语言( )
【判断题】在各种资金来源中,只有债务资金能产生财务杠杆作用。
【单选题】患儿,女,1岁,母乳喂养,未加辅食,近1个月来患儿出现皮肤、面色苍黄,表情呆滞,反应迟钝,少哭不笑。入院后检查发现肝脾轻度肿大,血红蛋白为70g/L, 血清维生素B1290ng/L,血清叶酸3.5μg/L。针对该患儿的治疗措施,正确的是:
【单选题】下列脂肪酸1软脂酸、2亚油酸、3亚麻酸、4油酸、5花生四烯酸属于必需脂肪酸的是