单项选择题

When was silk introduced to the Roman Empire?
A、The 4th and 3rd centuries BC.

B、At some point during the 1st century BC.

C、At some point around the year 3,000 BC.

D、At some point around the year 2,700 BC.

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多项选择题

What subjects belong to the discipline of foreign languages and literatures? （）
A. Foreign literatures

B. Foreign linguistics

C. Translation studies

D. Comparative literature and cross-cultural studies

E. Area studies

单项选择题

是最主要和最常见的致病因素

A．饮食习惯
B．生活习惯
C．情绪
D．病原体对人体的感染