问题 问答题 简答题

竹材和木材解剖构造有何差异?

答案

参考答案:

竹材是单子叶植物,维管束成不规则分布,没有径向传递组织和形成层,具有节间分生组织,无真正的髓和射线组织,节中空、节间以节膜相隔,具空髓,所有细胞都严格地按轴向排列,其构造较木材为整齐。木材是双子叶植物,维管束在幼茎初生组织中呈环状分布,束中形成层连成一圈,形成形成层,具髓和木射线

判断题
阅读理解

Once upon a time,two brothers who lived on neighboring farms fell into conflict(冲突).It was the first serious one between them in 40 years of farming peacefully side by side. In the end,they fell apart.

One morning,a man with a carpenter's toolbox came for some work. The elder brother said,“I just have a job for you. Look at that farm across the creek(河沟).My younger brother lives there. It was he who used his bulldozer(推土机)to dig the creek last week to spite(刁难)me. So I want you to build me a fence,an 8­foot­high fence,in order not to see his place any more.”The carpenter smiled and said,“I see. I'll try to do a job that satisfies you.”Then the elder brother went downtown.

At sunset when the farmer returned,the carpenter had just finished his job. The farmer's eyes opened wide! To his surprise,there was no fence there at all!Instead, there was a bridge stretching from one side of the creek to the other! A fine piece of work! He saw his younger brother coming to him with the hands outstretching. The brothers stood at each end of the bridge,and then they met in the middle,taking each other's hands. They turned to see the carpenter lift his toolbox on his shoulder. “No,wait! Stay a few days. I've a lot of other work for you,” said the elder brother.“I'd love to stay on,”the carpenter said,“but I have so many more bridges to build.”

小题1:What was the life like for the two brothers before the conflict?

A.They lived a poor life.

B.They lived in peace.

C.They never spoke to each other.

D.They lived on the same farm.小题2:It can be learned that the carpenter was __________.

A.unwilling to obey the farmer.

B.fond of building bridges.

C.unable to build a fence

D.willing to help others.小题3:Which of the following is TRUE according to the passage?

A.The elder brother used his bulldozer to dig a creek.

B.The elder brother helped the carpenter build the bridge.

C.The brothers were both satisfied with the carpenter's work.

D.The carpenter planned to build an 8­foot­high fence as asked to.小题4:The best title for this passage is ________.

A.A Fine Piece of Work

B.A Carpenter

C.A Conflict Between Two Brothers

D.Two Brothers