American dictionaries generally use____ to mark the pronunciation.

Comment on the following groups of words in terms of types of antonyms: contradictory terms, contrary terms, relative terms.“same - different”，“hot - cold’’，“parent - child”

What does the underlined word mean in the following sentence and what contextual clue is used?“Do you know the (architect)? He designed St. Paul’s Cathedral.”

I want to be TV’s (czar) of script and grammar.“Czar” in the above sentence is used to be a proper noun. Explain its meaning in relation to its origin.

What are the three main sources of new words in present-day English vocabulary? Match the following expressions with the three sources as examples.“green revolution”，“fast food’’，“the fourth world”，“Mao jackets”，“open heart surgery ”

Explain what is polysemy from the diachronic point of view.

a) They now eat better food, live in better houses, and wear better clothes than ever before,b) They are now better fed, better housed, and better clothed than ever before.Compare the above two sentences and explain the effect of using nouns as verbs.

elevation

metonymy

semantic motivation

Three good general dictionaries are LDCE, CCELD and .