Question 1. Air pollution has many effects _____ the environment and living organisms. *
A. in
B. of
C. for
D. on
Question 2. The volcano has erupted approximately once every ten years _____ 1970. *
A. since
B. in
C. from
D. for

Question

anhthu · Answer

Question 1.    chọn  D. on       Question 2.    chọn  A. since

minhuyen · Answer

1d   2a

Question 1. Air pollution has many effects _____ the environment and living organisms. * A. in B. of C. for D. on Question 2. The volcano has erupted

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