Укажите слово, которое замещает «one/ones».
1. The problem of environment protection has become the most important one.
a) problem b) environment c) protection
2. An engine is any machine that uses energy to transform it into mechanical one.
a) engine b) machine c) energy
3. A force is the action of some body on another one.
a) force b) action c) body
4. In the electric motor we can readily observe the fact that electric energy can be converted into mechanical one.
a) motor b) energy c) fact
5. Some substances are efficient conductors, others are poor ones.
a) substances b) conductors c) others

khadeevaelena    3   12.05.2020 11:00    1