Which of the following expressions of the sentence "The present Prime Minister of Viet Nam is Nguyen Tan Dung" DOES NOT have constant reference?

A. Osama bin Laden

B. Afghanistan

C. Hide

D. a and b

A. Analyticity is a sense property of predicates.

B. Contradiction is a sense relation between predicates.

C. Syntheticity is a sense property of a sentence.

D. Contradiction is a sense relation between sentences.

A. It occurs in an equative sentence.

B. It can be used to refer to different potential referents.

C. It never refers to different things or different persons.

D. It is not a referring expression.

A. Bill didn’t see a person entails Bill saw a boy.

B. Bill didn’t see a boy entails Bill didn’t see a person.

C. Bill didn’t see a boy entails Bill saw a person.

D. Bill didn’t see a person entails Bill didn’t see a boy.

A. Bachelors are innocent men.

B. Bachelors are not human beings.

C. Bachelors are never married.

D. Bachelors are male.

A. Sentence

B. Utterance

C. Proposition

D. a and c

A. Bachelors are male.

B. Bachelors are not reptiles.

C. Bachelors are not human beings.

D. Bachelors are lonely.