Organisms play ________ important role in keeping the nature balanced.
A. a
B. the
C. an
D. x
Giải bởi Vietjack
Đáp án: C
Giải thích: cụm từ play an important role in: đóng vai trò quan trọng trong
Dịch: Các loài vi khuẩn đóng vai trò quan trọng trong việc làm thiên nhiên cân bằng
A big ocean in the world is divided ___________ five different parts: the Pacific, Atlantic, Indian, Antarctic and Arctic Oceans.
Today’s scientists have overcome many of the challenges of the depth by ________ more sophisticated tools.
They can send submarines to take photographs of animal life and bring back to the __________ for further study.
A large number of jellyfish are _________ stake due to overhunting.
This season's _______ include five new plays and several concerts of Chinese and Indian music.
The director _______ for the meeting by the time I got to his office.
My mother told me she _______ very tired since she came back from a visit to our grandparents.
They will never forget _______ the man-eating shark at the beach.
