THE ENVIRONMENT PRACTICE TEST 1I. CHOOSE THE WORD OR PHRASE THA...

33. - 200 CAU TRAC NGHIEM KQ ANH 9 -BAI 6-7
200 CAU TRAC NGHIEM KQ ANH 9 -BAI 6-7

33.

People all over the world are worry about the problems that are happening to our environment.

a b c d