五、根据短文内容，从短文后所给的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项
Lu Ban was a famous craftsman(工匠）and inventor in ancient(古代的）times.
1. The palace had to be great, so the work was enormous(巨大的). 2. For example, first, they needed a lot of wood. Second, they must finish the work in a short time. The most important one was that there were no saws(锯子）at that time. 3. Although they were so tired, they could only cut down a small number of trees in a day.
Once, he went into the woods to cut down trees. His hand was hurt by a kind of grass because of his carelessness. 4. They were very sharp. He thought of an idea. Maybe the teeth could help them cut down trees faster. He began to have a try. After many tests, he invented the sharp saws in the end. 5. Until today, saws are still useful tools in the world.
A. They kept cutting the trees down day after day.
B. There's an interesting story about its invention.
C. One day, Lu Ban and his apprentices(徒弟）were asked to build a palace.
D. This made them work more easily
E. To his surprise, he found that the grass had special teeth.
F. They had many problems.
G. He thought all day and all night.

1.C 2.F 3.A 4.E 5.D