第24题: [单项选择]一昼夜人体血液中生长激素水平最高是在 A. 饥饿时 B. 寒冷时 C. 觉醒时 D. 熟睡时 E. 困倦时 参考答案:D 答案解析:[解题思路] 一昼夜中,人在觉醒状态下,删分泌较少,进入慢波睡眠后(熟睡时),删分泌明显增力口,约在60min左右,血中GH浓度达到高峰。故一昼夜人体血液中生长激素水平最高是在熟睡时。选D。
第32题: [单项选择]What does the new system enable the farmers to do A. Produce vegetables of better taste. B. Transport produce more quickly. C. Grow crops in nontraditional climates. D. Keep vegetables fresh for a longer period. 参考答案:C 答案解析:[解析] Cool climate vegetables like asparagus are now able to be grown in places as hot as Hawaii.