【改编】Mom’s birthday present? It may be a difficult thing for some people, but for me, it is an easy thing. Mom loved flowers, so every year I sent her flowers. Actually she had a bed of irises（鸢尾花）in the backyard of her small, Indiana farm. They were beautiful. “Take some,” she said, “Dig some up and plant them on the side of your own house.”
But in my yard they became lacking in energy. A year passed, then two, but not one flower appeared. I cut back all their green leaves. I was tired of seeing them so lonely. Finally, I dug the irises up and threw them away.
About that time Mom died unexpectedly. My sister and I sold the farm. I never went back to see the irises. I just couldn’t bear seeing another family living in our home—Mom’s home. Autumn came, then winter. The following spring, as Mom’s birthday approached, I struggled with the question of how to remember her. I stared out the window and saw a few stubborn irises in my side yard sprouting (发芽), —tall, thin but flowerless. Because of seeing them, I decided to order flowers as I always did on Mom’s birthday, and send them to my sister. I wished so badly I could still send flowers to Mom. But that was impossible.
In the morning of Mom’s birthday, I was in my car ready to work. Something in the yard caught my eye. The irises! One had bloomed with flowers, big, showy and purple, as lovely as they ever had been on Mom’s farm. I smiled and turned my eyes upward. I could no longer send flowers to Mom. But somehow, she’d been able to send them to me.
From the first paragraph we know________.

A．the writer doesn’t know what to buy for her mother on her birthday

B．some people have difficulty choosing birthday gift for their mother

C．Mother lived with the writer on the farm

D．Mother doesn’t like flowers including irises

What happened to the irises that the author grew?

A．They only grew green flowers.

B．They grew as well as those on her mother’s farm.

C．They were thrown away at last.

D．They ended up with beautiful flowers.

Why didn’t the writer return to the farm after her mother died?

A．Because she was too busy to go there.

B．Because her sister told her not to.

C．Because she lived far away from the farm.

D．Because she couldn’t stand the fact that her mother was no longer there.

From the third paragraph we can know _____.

A．not all the irises were dug out

B．the writer returned to her mother’s farm

C．the writer often sends flowers to his sister

D．the writer buys flowers in memory of his mother every year

What is the writer’s purpose to write this passage?

A．To introduce a kind of irises.

B．To memorize her mother.

C．To explain how to grow irises.

D．To praise the spirit of irises.