53. Specialisation and the effort to increase yields have resulted in________. (A) Localised pollution (C) competition from overseas (B) the shrinking of farmland (D) the decrease of biodiversity

61. According to the author, the burning issue concerning immigration is_______. (A) How to deal with people entering the U.S. without documents (B) How to help immigrants to better fit into American society (C) How to stop illegal immigrants from crossing the border (D) How to limit the number of immigrants to enter the U.S.

53. Specialisation and the effort to increase yields have resulted in________.
(A) Localised pollution
(C) competition from overseas
(B) the shrinking of farmland
(D) the decrease of biodiversity

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