根据短文内容，完成下列短文。每空一词。
A little old man and his wife walked slowly into McDonald's on a cold winter evening. The little old
man walked to the cashier (收银处) to order.
There was one hamburger, some French fries and one drink. He carefully divided the hamburger in
half and the French fries in two piles. Then he neatly put the half of the food in front of his wife. Both he
and his wife took a sip (一小口) of the drink. "How poor the old couple are!" the people around them
might think. As the old man started to eat his hamburger and his French fries, his wife sat there watching
him. They took turns to drink. A young man came over and offered to buy another meal for them. But
they refused politely and said they got used to sharing everything; Then a young lady asked the wife,
"Excuse me, Madam, why aren't you eating? You said that you shared everything. Then, could you tell
me what you are waiting for?" She answered in a smile, "The teeth. "
One evening, a little old man and his wife walked slowly into McDonald's. They 1 one hamburger,
some French fries and one drink . The little old man 2 the food into two portions. They took a sip
of the drink. As the old man started to eat food, his wife sat there 3 him. They took turns to drink.
A young man offered to buy 4 meal for them. But they refused and said they got used to 5
everything. A young lady asked the wife what she was waiting for. She said she was waiting for "The
teeth. "
ｐC（ｇ）＋ｑD（ｇ）反应过程中，其他条件不变时，产物D在气体中的质量分数D％与温度T或压强p的关系如图所示，请判断下列说法正确的是