题目

Tom is in good health, because he often exercises and eats a lot of healthy __________.A. strawberry B. food C. water D. junk food 答案：【答案】B【解析】句意：汤姆的健康状况很好，因为他经常锻炼和吃许多健康的食物。名词的词义辨析。A.草莓；B.食物；C.水；D.垃圾食品。根据句子中Tom is in good health．汤姆身体健康。由此可以推断出：he often exercises and eats a lot of healthy food他经常锻炼并吃许多健康的食物。此空是食物的意思，此空故如图，已知在平行六面体ABCD—A′B′C′D′中，AB=4，AD=3，AA′=5,∠BAD=90°,∠BAA′=∠DAA′=60°，求AC′的长.