问题 选择题

一棵小杨树被人剥去一圈树皮后不久就会死亡,分析其原因是(  )

A.切断了导管,根缺少了有机物

B.切断了筛管,根缺少了无机物

C.切断了导管,根缺少了无机物

D.切断了筛管,根缺少了有机物

答案

筛管是植物韧皮部(树皮内侧)内输导有机养料的管道.由许多管状活细胞上下连接而成.相邻两细胞的横壁上有许多小孔,称为“筛孔”.两细胞的原生质体通过筛孔彼此相通.筛管没有细胞核,但筛管是活细胞.剥掉树木主干的一圈树皮,树皮被剥,有机物的运输通道筛管被割断,叶制造的有机物不能由筛管向下运输到根;根得不到有机物,根不能进行呼吸作用获得能量,时间长了就会导致树木死亡.
故选D.

阅读理解

In front of my daughter, Shelly, was a bowl filled with cabbage. She hated cabbage. She only sat there in silence with tears in her eyes.

“Shelly, my dear, why don’t you eat a little? If not, your mum will shout at us.”

Shelly didn’t feel happy. “OK, dad. I will eat, just a little.” Then Shelly said, “Dad, if I eat it all, will you give me what I want?”

“Yes.”

Slowly she began to eat. It took her almost half an hour to finish all the food in the bowl. Then she came up to me and said, “Dad, I want to have my hair cut off!”

“Shelly, why don’t you ask for something else? If we see your head like that, we’ll feel very sad,” I said.

“But Dad, you promised! Now you’re going back on your words. ”

I had to keep my promise. Shelly had all her hair cut off. She smiled.

On Monday morning, I took Shelly to school. Just when I arrived, a boy got out of a car and shouted, “Shelly, please wait for me!”

Guess what? The boy had no hair, either.

“Sir, your daughter is great!” a man got out of the car and said, “This boy is my son, Harish. He has cancer. He lost his hair when he got ill. Shelly cut hers off so Harish felt less different. She is a special girl.”

I stood for a while, “My little daughter, you teach me how selfless real love is!”

小题1: Shelly _____________ before she ate her meal.

A.felt happy

B.felt unhappy

C.cut off her hair

D.shouted at her dad小题2: In order to get what she wanted, Shelly ate ______________ at last.

A.all the food in the bowl

B.nothing

C.just a little of the cabbage

D.everything except the cabbage小题3: By cutting off her hair, Shelly only meant _____________.

A.to tell people she was selfless

B.to become more different

C.to look more special and beautiful

D.to show her care and love for Harish

口语交际,情景问答题