Câu hỏi: Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

A. record

B. shine

C. categorize

D. diversify

Câu 1: Professor Berg was very interested in the diversity of cultures all over the world.

A. variety

B. changes

C. conservation

D. number

Câu 2: She came to the meeting late on purpose so she would miss the introductory speech.

A. aiming at

B. intentionally

C. reasonably

D. with a goal

Câu 3: The bomb exploded in the garage; fortunately no one hurt.

A. taken off

B. went off

C. put on

D. hold up

Câu 4: This quartet of extraodinarily talented musicians generated a phenomenal number of pieces that won gold records.

A. irresponsible

B. incompetent

C. stupid

D. crazy

Câu 5: The augmentation in the population has created a fuel shortage.

A. increase

B. necesity

C. demand

D. decrease

Câu 6: The journalist refused to disclose the sourse of his information.

A. open

B. reveal

C. shut

D. conceal