通读下面短文, 掌握其大意, 然后在每小题所给的四个选项中, 选出一个最佳答案, 并将答题卡上对应的选项涂黑。
My parents are busy with their work every day. You can't see there is love 1 them. They don't act in the romantic（浪漫的）2that I read in books or I see on TV.
One day, while Mom was sewing(缝) a quilt，I 3 beside her. “Mom, I have a question,” I said after a while.
“What?” she asked.
“Is there love between you and Dad?” I asked her in a very low voice.
She stopped sewing and 4 her head. Then she bowed her head and went on sewing.
I thought I had hurt her. At last I heard my mother say， “Susan, look at this thread（线）. Sometimes it appears, but most of it disappears in the quilt. It makes the quilt5. If life is a quilt, then love should be a thread. It can hardly be seen, but it's 6 there.”
I couldn't understand her 7 the next spring. My father suddenly got sick. Mom had to stay with him in the hospital for a month.
After they 8, my mother helped my father walk slowly down the country road every day. My father had never been so gentle.
“Dad, how are you 9 now?” I asked him one day. “Susan, don't worry about me,” he said. “I just like walking with your Mom.”
Once I thought 10 meant flowers, gifts and sweet kisses. But from this experience, I understand that it is just a thread in the quilt of our life . It is inside, making life strong and warm.
的元素个数有（ ）