1. 1. These are mineral resources. Mineral resources are of high quality.

    2. This is a factory manager. The factory manager has many duties.

    3. This is trade. Trade has a tendency to grow now.

2. 1. b);

    2. d);

    3. c);

    4. a).

3. 1. b);

    2. c);

    3. e);

    4. d).