26. Doctors have long been puzzled by . A. why red meat is harmful B. how beneficial fish are C. what makes fish healthful D. how red meat is replaced 27. We can learn from the passage that . A. human beings get omega-3s from their food ...
34.All that can be done ___. A)have been done B)have done C)has done D)has been done 35.A person beating a drum or blowing a trumpet causes vibrations in the air ___ sound waves. A) calls B) called C) is called D) are called 36...
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