阅读理解；阅读下面短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
Little Tommy was doing very badly in math. His parents had tried everything—tutors (家庭教师), cards, special learning centers—in short, everything they could think of. Finally they took Tommy to a catholic (天主教的) school.
After the first day, little Tommy came home with a very serious look on his face. H-e didn’t kiss his mother hello. Instead, he went straight to his room and started studying. Books and papers were spread (铺开) out all over the room and little Tommy was har
d at work. His mother was surprised. She called him down to dinner and as soon as he finished eating, he went back to his room, without a word. In no time he was back hitting t-he books as hard as before. This went on for 
some time, day after day while the mother tried to understand what was happening.
Finally, little Tommy brought home his report card. He quietly put it on the table and w-ent up to his room and hit the books. His mom looked at it and to her surprise, little T-ommy got an A in math. She could no longer hold her curiosity (好奇心). She went to his room and asked, “Son, what was it? Was it the nuns (修女)?”
Little Tommy looked at her and shook his head, “No. ”
“Well then,” she asked again. “WHAT was it?”
Little Tommy looked at her and said, “Well, on the first day of school, when I saw that man nailed (钉) to the plus sign (加号), I knew they weren’t joking. ”
根据以上短文内容，然后从每题所给的四个选项中选择最佳选项。
( ) 1. Why did Tommy’s parents send him to a catholic school?
A. Because he could eat well there.
B. Because he could earn more about nuns.
C. Because his parents wanted him to do better in his math.
D. Because his parents didn’t want him to learn math any more.
( ) 2. Tommy’s mother felt surprised that his son _______.
A. was still the same as usual
B. ate so much at dinner
C. kissed her hello after school
D. worked hard but said little
( ) 3. “Hitting the books” means “_______” in Chinese.
A. 用功 B. 捶书 C. 发泄 D. 振作
( ) 4. The last sentence in the passage shows that _______.
A. Tommy felt sorry for the mail
B. Tommy was afraid of being nailed
C. Tommy didn’t like the plus sign
D. Tommy liked playing jokes on others
( ) 5. From the passage, we can infer (推断) that _______.
A. teachers should be strict with their students
B. mistaking (误解) might do good sometimes
C. a catholic school is much better than other ones
D. nuns are good at helping children with their math