Предмет: Русский язык, автор: Виктория3561

примеры продуктов жизнедеятельности грибов:....
помогите пожалуйста!!! Я на уроке и незнаю

Ответы

Автор ответа: RAsTafarIaNJah
1
Среди продуктов жизнедеятельности грибов (плесени) , обладающих канцерогенным действием, наиболее изучен афлатоксин В. Этот микотоксин является гетероциклическим соединением и продуцируется плесенью Aspergillus flavum. Канцерогенное действие афлатоксина проявляется в очень малых дозах — 0,02 мг/кг массы. Для сравнения, токсическое действие цианида калия проявляется в дозах, превышающих указанную в несколько десятков раз. С влиянием микотоксинов связывают развитие первичного рака печени у представителей племени Банту в Африке. Климат территории, на которой проживает это племя, очень влажный, поэтому продукты питания быстро покрываются плесенью. По существующей в тех местах традиции такие продукты пригодны к использованию. Анализы показали, что в потребляемой пище содержится афлатоксин В.
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Ex2: Choose the best answer, using the correct passive forms of the verbs.

1. English is all over the world.

A. is spoken

B. speak C. is spoke

D. speaks

2. You

a present when you go to the party tomorrow night.

A. will give B. will given C. are given D. will be given

3. Look! The trees and flowers care of by the gardeners.

A. are being taken

B. taken

C. were taken

D. is taken

4. A new university

in my town in the near future.

A. is built

B. will be built C. was built

D. has been built

5. Thousands of people

by natural disasters every year.

A. are affected B. are affecting

C. have affected

D. were affected

6. These toys

in our country.

A. can make

B. can be make

C. is made

D. can be made

7. Nam doesn't his motorbike today. It

right now.

A. is repaired B. is being repaired C. is repairing

8. Two new supermarkets

in the neighborhood

D. is being repair

recently.

A. has been built B. is being built C. have been built

D. has built

9. The wall before you paint it.

A. must be cleaned B. should cleaned

C. might been cleaned

D. must cleaned

10. My brother

by a dog last night.

A. was bite B. was bitten

C. is bitten

D. bit

11. My room

in the house by her now.

A. is being cleaned B. are being cleaned C will be cleaned D. would be cleaned

12. Tom by Mary since 10 o'clock.

A has operated B. have operated C. has been operated D. have been operated

13. Someone

to take his place. A. must be find B. might be find C. should be finds

D. must be found

14. That book

by Tom yesterday.

A. bought

B. is bought

C. were bought

D. was bought