什么是An illocutionary act; An illocutionary act名词解释定义是什么?

名词解释什么是Reference; Reference名词解释定义是什么?

名词解释什么是Morphology; Morphology名词解释定义是什么?

名词解释什么是Linguistics; Linguistics名词解释定义是什么?

单项选择题（）language belongs to the Sino-Tibetan Family.

A.English
B.Spanish
C.Indian
D.Chinese

单项选择题Lying under the skull, the human brain contains an average of the ten billion nerve cells called（）.

A.neurons
B.nerve system
C.nerves
D.cerebral cortex