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如果c≠0，则下列各式中一定正确的是（　　）

Tom and Tim are brothers. They are Australians. They live in a mountain village(山村). Tom is 104 years old and Tim is 102 years old now. They1their story in a book called Enjoy Our Life.
Here is some of their advice for living a long, healthy life.
★Get up2. They get up at 6:30 or 7:00 in the morning.
★Have a3 breakfast. The brothers eat oatmeal (燕麦粥), half a banana, bread and eggs with a little cheese (奶酪).
★4 every day. The brothers like to climb mountains. They also walk on the hills (小山) every day.
★Eat a lot of 5, especially (尤其) garlic (大蒜). Garlic is good 6your health.
★Don’t eat a lot of salt (盐) and fat. These things are7 for your body (身体).
★8listen to the doctors always. Most of the doctors don’t know what to do with us. When something is9 with us, they don’t know how to treat (治疗) us. They are always surprised (吃惊) to see us to live so 10 .

宋人朱彧的《萍洲可谈》记载，张乖崖任崇阳县令时，“尝逢村氓（méng，乡民）市菜一束出郭门。问之，则近郊农家。乖崖笞之四十，曰：‘尔有地而市菜，惰农也。崇阳民闻之相尚力田。”材料中张乖崖的做法实质上是（    ）

某一多肽链内共有肽键109个，则此分子含有氨基和羧基的数目至少为 （    ）