... Structure and Written Expression 1. The giant ragweed, or buffalo weed, grows (A) 18 feet up to high (B) to high 18 feet up (C) up to 18 feet high (D) 18 feet high up to 2. Neptune is ... American continent. Second, factories demand a large labor supply. Between the 18 70’s and the First World War (19 14 -19 18), approximately 23 million immigrants streamed to the United States, settled ... feathers (D) only losing one-third of their feathers 18 .The word “Others” in line 21 refers to (A) ducks (B) sides (C) species (D) flight feathers 19 .The author discusses ducks...