阅读理解。
Harry is nine years old. He goes to the school next to his home. He always walks to and back from
school. One day he comes back from school late .His mother sees him and asks, "Why are you late,
Harry?"
"My teacher is very angry and asks you to go to her office tomorrow."
"To her office? Why? "His mother asks. "Because she asks a question in the class and I am the only
person who can answer it." says Harry.
"You are so clever, my son." his mother says with a smile.
"Her question is who put the tomato on her chair and make her clothes dirty?" says Harry.
1. _____ can answer the teacher's question in class．
A. Nobody
B. Harry
C. Many students
D. A few students
2. There's a _____ on the teacher's chair.
A. tomato
B. book
C. pen
D. bag
3. The teacher asks Harry's mother to school because _____.
A. Harry is nine
B. Harry goes to school on foot
C. Harry's home isn't far from the school
D. Harry makes her angry
4. Is Harry very clever?
A. Yes, he is.
B. Yes, he isn't.
C. No, he is.
D. No, he isn't.
+13O2
8CO2 + 10H2O，丁烷的化学式为