Task 1
1. Both the metals and the polymers can be alloyed.
2. It is possible to develop polymeric substances with the scheduled properties.
3. The so-called "aging" of the polymers is due to chemical and physical changes caused by the effect of light, heat and humidity.
Task 2
1. Polymers are characterized by their viscosity colour and softening points.
2. The properties of the polymers depend on their super-molecular structure.
3. The main concern of researchers and engineers is to improve the quality of mass produced goods.
Task 3
1. Polymers are widely used in industry.
2. Light, heat and humidity affect the polymers.
3. The main concern of the researchers and engineers is to improve the quality of polymers.
Everyone says that London is wonderful. I agree! I visited London two years ago.
It (1 be)was a great trip!
When I arrived in London first, I (2 go) went to the Tourist centre. There I got
information about places to visit and sights of interest. It helped me to plan (3 I)my
excurcions.
The weather was (4 good) better than I expected and I decided to visit London parks.
I liked Hyde Park so much! It is really beautiful!
When I (5 come) came back to Moscow, my friends asked me, “You didn’t like
British weather, did you?” I answered, “Yes, I (6 do) did! The weather was sunny
and warm. I liked everything.”
Объяснение:
