阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。
I remember, as a kid I had questioned Mom
“Why doesn’t Dad love me!” Mom frowned. “Who said he doesn’t love you!” “Well,
he never tells me,” I complained. “He never tells me either,”she said, smiling.
“But look how hard he works to take care of us, to buy us food and clothes, and
to pay for this house. That’s how your father tells us he loves us.”
After Mom died, I began visiting Dad every
morning before I went to work. He was frail and moved slowly, but he always had
a glass of freshly squeezed orange juice for me. Such a gesture, I knew, was as
far as Dad had ever been able to go in expressing his love. Every time after
drinking the juice, I walked over, hugged him and said, “I love you, Dad.” My father
never told me how he felt about my hugs, and there was never any expression on
his face when I gave them.
Then one morning, pressed for time, I drank
my juice and made for the door. Dad stepped in front of me and asked, “Well!” “Well
what?”I asked, knowing exactly what. “Well!” he repeated, looking everywhere
but at me. I hugged him extra hard. It was the right time to say what I’d
always wanted to. “I’m fifty years old, Dad, and you’ve never told me you love
me.” My father stepped away from me. He picked up the empty juice glass, washed
it and put it away. “You’ve told other people you love me.” I said, “but I’ve
never heard it from you.” Dad looked very uncomfortable. I moved closer to him.
“Dad, I want you to tell me you love me.” Dad took a step back, his lips
pressed together. He seemed about to speak, and then shook his head. “Tell me”,
I shouted. “All right I love you,” Dad finally blurted. His eyes watered, then
overflowed.
I stood before him, stunned and silent. My
father loved me so much that just saying so made him weep. Mom had been right. Every
day of my life Dad had told me how much he loved me by what he did and what he
gave. “I know, Dad,” I said. “I know.” And now at last I did.
2Z(g) ΔH＜0，如图表示该反应的速率（v）随时间（t）变化的关系，t2、t3、t5时刻外界条件有所改变，但都没有改变各物质的初始加入量。下列说法中正确的是
