阅读下面的短文，掌握其大意，然后从各题所给的A、 B、 C三个选项中，选出一
个最佳答案。
In spring, the mother pig took the little pig Lulu to the foot of the mountain. They planted some 21. There were many big round watermelons in the field when 22 came.
One day, the sun was burning like fire, and it was terribly hot. The mother pig asked Lulu to go to the field and pick a watermelon by 23. Lulu answered happily and ran to the watermelon field.
When he got to the field, he was excited to find so many big watermelons. He chose one of the 24 watermelons and picked it. Then he tried to lift it 25 his shoulder to carry it home.
"Wow! It's so heavy!" Lulu tried several times, but he failed again and again. He felt so tired that he decided to 26.
Suddenly he saw the monkey Pipi 27 with a hoop 环. Lulu thought since the round hoop can roll 滚动. The watermelon can roll too, 28 it was also round. Then he put the big watermelon on the ground and rolled it forward 29.
At last he got home with the watermelon. After knowing the story, the mother pig 30 Lulu, "My child, you're really clever! Remember, use your head and you will always find a way!"
2l. A.rice B.trees C.watermelons
22. A.spring B.summer C.winter
23.A.myself B.yourself C.himself
24.A.reddest B.smallest C.biggest
25. A.on B.off C.behind
26. A.give up B.standup C. getup
27.A.swimming B.playing C.sleeping
28. A.so B.but C.because
29.A.carefully B.badly C.clearly
30. A.beat B.praised C.improved