题目内容

尿液中的K+主要来源于

A. 原始尿液中的K+
B. 远曲小管和集合管上皮细胞分泌的
C. 近曲小管上皮细胞分泌的
D. 髓襻上皮细胞分泌的

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_____, also called the Chinese New Year, is China's most important festival that falls on the first day of the first lunar month each year. Family members gather just as westerners do on Christmas.

A.The Spring Festival
B.The Mid-Autumn Festival

2.The major custom of the Qingming Festival is _______.

A.Burning firecrackers
B.tomb sweeping

3._______ has been regarded as China's Valentine's Day.

A.The Double Seventh Festival
B.Dragon Boat Festival

4.In 1989, the Chinese government designated the Double Ninth Festival as "_______ Day".

A.Youth's
B.Senior Citizens'