scientists believe that people can improve their moods with _____

A can't

B mustn't

C needn't

D shouldn't

A thinking

B think

C to think

D thought

A since

B when

C as

D while

A. idea

B. punishment

C. behavior

D. instruction

A. if the winter is especially warm

B. during all of the year except the winter

C. in the winter as well as in other seasons

D. during the evenings in the winter

A.but

B.what

C.as

D.that

A.essentially

B.especially

C.specially

D.strangely

A. made same words

B. made different kinds of words

C. had a same language

D. used some sounds

A. American stores could provide new kinds of products to people.

B. High tech describes a technology that is not traditional.

C. "State of the art" is not as popular as "high tech".

D. A modern plough pulled by oxen is "state of the art".