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Укажите химический символ, число протонов и массовое число нуклеотидов которое содержит: а) 12 электронов и 13 нейтронов; б) 20электронов и 20 нейтронов;
Ответы 1
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а) Mg -12p, 25б) Ca - 20p, 40
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Автор:
phillip - 6 лет назад
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Пожалуйста, помогите сделать упражнение, выбрав правильные варианты ответа
1. Choose the correct items
1. I think that he is___this problem without___.
a) enough clever to solve, helping
b) clever enough to solve, being helped
c) clever enough to solving, being help
2. The most important thing for me___was___a good job.
a) to do, to find
b) doing, finding
c) do having found
3. Soon i got used___in this hot country and stopped___
a )to live, complaining
b) living, to complain
c) to living, complaining
4. I don't feel___to the concert tonight. I would rather___a film.
a) as going, seeing
b) going, to see
c) like going, see
5. He Seemed___a lot of trips recently. I want him___at home for a while.
a) to take, staying
b) to have taken, to stay
c) to be taking, stay
6. I've always dreamt___my own business but something prevented me___it.
a) of opening, from doing
b) about opening, to do
c) to open, of doing
7. Sue couldn't help___because she had never expected___like that.
a) to cry, betray
b) to be crying, to betray
c) crying, to be betrayed
8. The person who really makes me___is my friend Kim without whom life could___much duller.
a) laughing, have been
b) to laugh, be
c) laugh, be
9. When i saw___there tonight, i thought he must___crazy.
a) him standing, be
b) his standing, be
c) him stand, had been
10. The students were in charge___this party and they were happy___the leaders.
a) of organizing, to be
b) for organizing, being
c) to organize, to be
11. You'd better___a good excuse___so late___in trouble.
a) have, to be late, don't get
b) to have, of having been, not get
c) have, for being, not to get
12. Sam is difficult___; we cannot fully count___good business with him.
a) to deal with, on having
b) for dealing to, to have
c) to be deal with, for having
13. In some countries snails are considered___great delicacies to but i cannot___them.
a) being, try
b) to be, try
c) having been, to try
14. Volunteers from Europe worked in___countries to help the___their life.
a) developed, to improve
b) developing, improve
c) developing, improving
15. I don't expect my children___junk food i want___fruit or vegetables.
a) smoking, to do
b) to smoke, doing
c) smoke, to do
16. His parents told him to give up___, but he refused___
a) smoking, to do
b) to smoke, doing
c) smoke, to do
17. The passengers watched the lights___and heard the flight atten (дальше в листке не видно что написано)___some announcements.
18. My mother objected___a dog in the house and i suggested___a cat.
a) to have, to bring
b) about having, to be bring
c) to having, bringing
19. Large American cities are filled with restaurants___international (здесь тоже плохо видно было) cooking.
a) serving
b) served
c) that serving
20. I don't remember ever___such things to you; so i don't need___you.
a) saying, to apologize to
b) to say, apologizing for
c) say, apologize to-
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