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: If people’s interference with the environment decreases, more species will survive and produce offspring.

A. children

B. ancestor

C. descent

D. result

Câu 2: The journalist refused to disclose the sourse of his information.

A. open

B. reveal

C. shut

D. conceal

Câu 3: An international medical conference initiated by Davison resulted in the birth of the League of Red Cross Societies in 1991.

A. treated

B. dedicated

C. helped

D. started

Câu 4: He drove so fast that I really felt my life was in danger.

A. at the target

B. in accident

C. at stake

D. in comfort

Câu 5: S. Mayo Hospital in New Orleans was so named in recognition of Dr. Mayo’s outstanding humanitarianism.

A. unpopular

B. widespread

C. remarkable

D. charitable

Câu 6: In my experience, freshmen today are different from those I knew 25 years ago.

A. first-year students

B. new students

C. new counselors

D. young professors