Several days ago，I went to my aunt's home and saw my cousin who is studying English linguistics in a university．He showed me his learning materials．Here are two pages of them．

Now I know at some point in history，the meanings of some common words that we see every day meant something much different．The English languages is developing all the time．

26．When did"nice"come to mean"shy and nervous"？　　

A．In the late 12th century

B．In the 13th century

C．During the 14th century

D．In the 18th century

27．The underlined word"these"refers to （指代）the following except that　　．

A．a loved one passes away

B．we expect too much progress in an exam

C．the store is out of our favourite drink

D．we have eaten too much food at dinner

28．The purpose of the passage is to tell us　　．

A．the meanings of all words are different at some point in history

B．my cousin learns English well because of his learning materials

C．we should know about all the different meanings of words in history

D．the meanings of some words are changing because language is developing．