Mr. Green is a famous writer now. But he said he was not a good student when he was young. He was often late for school and didn’t like doing his homework. Sometimes he slept in class while the teacher was teaching. He didn’t understand much, but he always thought he understood everything.
One day the teacher asked the students a question, “When John was ten years old, his brother was twenty. John is fifteen now and how old is his brother?”
Mr. Green answered, “That’s easy. His brother is twice as old as John, so he is now thirty.”
Another time, the teacher in a science class asked, “When it thunders(打雷), why do we always see the light before we hear the sound?” “But, Miss White,” said Mr. Green quickly, “can’t you see our eyes are in front of our ears?”
The third time, the teacher in a biology class asked, “Why can fish swim in the water?” “But, Miss White,” said Mr. Green quickly, “don’t you know fish can’t walk on land?”
Mr. Green _____ when he was a student.

A．understood much

B．did a lot of housework

C．didn’t like to do his homework

D．learned science and biology very well

How old is John’s brother when John is fifteen in the teacher’s question?

A．10 years old.	B．15 years old.
C．20 years old.	D．25 years old.

Mr. Green think when it thunders, we always see the light before we hear the sound because _____.

A．light goes faster than sound

B．our eyes are in front of our ears

C．our eyes are cleverer than our ears

D．our eyes can see but our ears can’t

Why can fish swim in the water? Mr. Green’s answer was _____.

A．fish can’t swim on land

B．fish can’t walk on land

C．fish has no legs or hands

D．fish can’t walk in the water