影响叶片大小、叶形宽窄、主脉粗细的遗传因素主要有（）
A.烤烟品种
B.等级
C.水分
D.施肥
参考答案：A
— How long_____like this?
— Three weeks! It's usual in here that rain_____without stopping these days of the year. [ ]
A. has it rained; pours
B. is it raining; is pouring
C. has it been raining; pours
D. does it rain; pours
蔗糖中特殊杂质检查（）
A.莨菪碱
B.洋地黄毒苷
C.洋地黄皂苷
D.亚硫酸盐和可溶性淀粉
E.还原糖
