用14C标记CO2,可用于研究光合作用过程中[ ]
A.光反应的条件
B.暗反应(碳反应)的条件
C.能量的转换过程
D.W由CO2合成糖类的过程
答案:D
阅读短文,选择正确答案。
Good News
Jim is a primary school student. He's in Grade Two now. He has a round face and wears glasses. He likes
playing football and swimming. But today he's not at school. He's ill. He's in bed. He has a bad cold. He must
stay in bed for a week. But that's good news for him, because he doesn't like school.
1. Jim is a student.[ ]
A. primary school
B. middle school
C. senior school
2. Jim is in Grade .[ ]
A. Too
B. Three
C. Two
3. Jim likes playing .[ ]
A. basketball
B. football
C. table tennis
4. Jim is in bed because .[ ]
A. he is tired
B. he is ill
C. he is sleepy
5. Jim must stay in bed for .[ ]
A. a day
B. a week
C. two weeks
具有清热解毒,凉血消斑的药物是
A.败酱草 B.金银花 C.鱼腥草 D.鸦胆子 E.大青叶