【名词&注释】
细胞周期(cell cycle)、培养基(medium)、卵磷脂(lecithin)、放射性标记(radiolabelling)、雌雄异株(dioecism)、直根系(axial root system)、脂质体聚合物
[单选题]具有直根系(axial root system)的植物是( )。
A. 油菜
B. 小麦
C. 玉米
D. 葱
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举一反三：
[单选题]What happened to George and Richard in the end?
A. Both George and Richard became millionaires.
B. Both of them realized their original ambitions.
C. George established a successful business while Richard was missing.
D. Richard became a millionaire while George had no great success.
[单选题]The report from NHTSA suggests that .
A. fewer people were injured in crosswalks
B. crosswalk safety has been greatly improved
C. much has been done to reduce traffic accidents
D. pedestrian deaths in crosswalk remain a serious problem
[单选题]植物花单性，雌雄异株，雄蕊花药全外向。
A. 樟属
B. 山胡椒属
C. 檫木属
D. 楠属
[单选题]When does the bank close on Saturday?
A. At 1:00 pm
B. At 3:00 pm
C. At 4:00 pm
[单选题]蚕豆根失细胞有含3H标记的胸腺嘧啶氧核苷培养基中完成一个细胞周期，然后在不含放射性标记的培养基中继续分裂至中期，其染色体的放射性标记分布情况是
A. 每条染色体的两条单体都被标记
B. 每条染色体中都只有一条单体被标记
C. 只有半数的染色体中一条单体被标记
D. 每条染色体的两条单体都不被标记
[单选题]固体脂质纳米粒系指以什么为骨架材料制成的纳米粒（ ）。
A. 高分子
B. 以生理相容的高熔点脂质
C. 高熔点脂质
D. 脂质体聚合物
E. 卵磷脂
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