As the most ________ spoken language in

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问题选择题

As the most ________ spoken language in the world，Chinese is taught in many schools in Europe.

A．frequently

B．properly

C．slightly

D．differently

答案

答案：A

答案　A　[作为世界上最频繁应用的语言，汉语在欧洲的很多学校被学习。]

选择题

To read Tolstoy and ____ to the nineteenth century Russian literature are two excellent reasons for taking Professor Morrel’s course.

A．to introduce

B．introduce

C．being introduced

D．to be introduced

计算题

低钠盐适合患有高血压、肾病、心脏病的患者服用，苹果酸钠盐(C₄H₅O₅Na)是低钠盐的一种。

请回答：

(1)苹果酸钠盐的相对分子质量是______。

(2)苹果酸钠盐中各元素的质量比为C:H:O:Na=______。