活的生物体细胞每时每刻都进行着各种生命活动．关于细胞的生活，以下说法正确的是（    ）

阅读下面的宋词，回答问题。

点绛唇•春愁

赵鼎

香冷金炉，梦回鸳帐余香嫩。更无人问，一枕江南恨。

消瘦休文^①，顿觉春衫褪。清明近，杏花吹尽，薄暮东风紧。

【注】①休文：即梁沈约，是一个多愁多病的才子。

    I had worked that day, as a nurse. Now I faced the dirty supper dishes. I wanted to 1why Jimmy hadn't phoned as usual to say “Good night”to Bob and Tom. “Maybe Daddy's 2 working on an accident,” I said to Bob. “Go to3 now. You'll see him in the morning.”Soon there was a knock at the door. “There4 be something wrong with your phone,” my neighbor told me. “The City Police Station wants you to 5.”
    I went into the living room and dialed. Then I 6 the words every police wife fears (害怕): “Your husband has been hurt.” When I reached the hospital, my heart sank (下沉). The entrance was jammed with TV-news trucks. In the 7  I saw Jimmy’s best friend, Smith. “Just tell me -is he alive ?” I asked.
    Smith 8. and didn't answer. Then I found my younger sister, Mandy. “He’9s ”she told me, and we began to cry together.
Later, Smith told me 10 had happened.
    In the morning, when my little Bob asked, “Where's Daddy?” I 11  him into my arms and tried to explain. “A bad man 12 Daddy last night.” I said. “Daddy can't come home any more. He's in heaven(天堂) now.”
My son looked at me, his blue eyes 13 the picture of trust(相信). “Do they have14 in heaven ?”he asked. “Can I call him ?”
“No, Bob, Daddy still loves you, but Daddy can't15”.

口算．

俄罗斯的地势东高西低，所以河流都自东向西流。