题干

人的生长激素和胰蛋白酶的成分都是蛋白质,但这两种蛋白质的功能却完全不同,其原因不包括

A:氨基酸的排列顺序不同

B:组成蛋白质的氨基酸种类、数量不同

C:蛋白质的空间结构不同

D:蛋白质中组成肽键的化学元素不同

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D

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    Many children in England get given lunch at school. There are new rules about what children may be given for these lunches. The reason for this is to give children healthier food. There are many foods that children aren't allowed to eat and they're only allowed to eat small amounts of fatty or sweet food. If you were at a school there, you might hear this conversation as you wait for your lunch.

    Josh:        What's for lunch? I want chips!

    Dinner lady: No chips today. You've had chips twice this week already.

    Josh:        Oh! OK, I'll have a chicken pie with gravy.

    Dinner lady: No, sorry. You've had a pastry dish (油酥食品) once this week already.

    Josh:        Really?Oh, yes, on Monday. Well, what can I have? I'd like pasta and sauce.

    Dinner lady: No, sorry. Pasta counts as (算作)a pastry dish. So you can't have that, either.You've had two pastry dishes this week-a meat pie and a pizza. You can have vegetables or salad. The meatballs are nice today.

    Josh:        All right. I'll have meatballs and steamed vegetables. I hope they're tasty.

    Dinner lady: They're good for you!

    Josh:        I miss my chips. They're my favorite. I used to have them every day, before these new rules came in.

Dinner lady: Well, that's why these rules were brought in. Too many children were eating junk food, especially chips. Children like chips, but they aren't a healthy choice.

    Josh:        I'll have an apple juice with that, please.

    Dinner lady: OK, but its only 150 ml. You aren't allowed more than that as juice has sugar in it. The new rules encourage you to drink water. No soft drinks at all.

    Students cannot have more than two portions (价额)a week of food that has been deep-fired.They must have at least three different fruits and three different vegetables every week. Whole grains such as brown bread are to be given,instead of "white" grains.

    These rules are to teach healthy eating and to stop children putting on too much weight. This will make sure that more people are healthy in the future.