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【单选题】
现代宇宙学认为,在宇宙的大量活动星系的中心普遍存在着( ),这些黑洞中较小的其质量只相当于太阳质量的100万倍左右,而较大的其质量可达太阳的十亿倍以上。A.
黑洞
B.
超级大黑洞
C.
原始黑洞
D.
微型黑洞
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【多选题】Which of the following statements are the benefits of a commonly used language?
A.
A bridge language makes it possible to communicate with people from different cultures.
B.
Owing to the communication in one commonly used language, traditions and customs of different cultures are transmitted.
C.
Intercultural communication activities, such as, international business, academic conferences, and political visits, etc. are helpful to spread one certain culture to other places.
D.
Because of the commonly used language, many local cultures disappear.
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