①English people have three meals（餐） a day. They are breakfast, lunch and dinner.

    ②They have breakfast at about 7:00 to 8:00 in the morning. They often eat or drink some fruit or juice first, and then they have some porridge(粥)，eggs and meat. Some English people like to take sugar (糖） in their porridge, and some like to put salt in it.

    ③For many people, lunch is a quick meal. Many of the office workers don't go home for lunch. They often buy a hamburger or sandwich in fast food shops. School children can have a hot meal at school, but many students only take a sandwich, a drink and some fruit from home for lunch.

    ④Dinner is the main meal for English people. They have dinner at about 6:00 to 8:00.Many people have dinner with their family at home. People cook it carefully, because they think dinner is very important. They have a lot of food for dinner: soup, fish, vegetables, tomatoes and bread or rice. After dinner they have some cakes, fruit or ice cream for dessert(餐后甜点).

根据短文理解, 从A、B、C、D四个选项中选择最佳答案填空。

    An old friend from the US whom I was looking forward to staying with telephoned from the airport to tell me that he had arrived. I was still at the 1  at that time, but I had got everything ready for his arrival. After letting him know where my house was, I told him that I had left the  2under the doormat(门垫),  3  I was likely to be home rather late. I told him to go into the 4 and help himself to food and drink. Two hours later my friend 5 me from the house. At the moment, he said, he was listening to some of my records after having just had a truly wonderful 6 . He had found a cooker and  7  two eggs and he helped himself to some cold chicken from the ice box. He said he was drinking a glass of orange juice and he hoped I would 8him. When I asked him if he had reached the house without difficulty, he answered, "I was not able to find the key,  9 luckily, the living-room windows Just by the apple tree were left open and you know what I could do." I listened to all this in 10 . In front of my living-room there was no apple tree at all.

某实验小组探究选稻种的实验，需配制质量分数为10%的氯化钠溶液105g，实验操作步骤如图所示：