抽穗期
参考答案:
全田有50%的麦穗露出剑叶鞘的时期。
为增强样本代表性,减轻调查户长期记账的负担,住户调查实行样本轮换制度。抽中调查小区中样本住宅调查周期为3年,每年轮换1/3的样本住宅。
—Would you like to have ______ to drink now?
—No, thanks. [ ]
A. anything cool
B. cool something
C. something cool
D. cool anything