About 70% of the total length is made up of double-track and multi-track lines, specialized for freight and passenger traffic. поставить 4 вопроса: общий специальный альтернативный подлежащий

1. Is About 70% of the total length made up of double-track and multi-track lines?

2. How many percent of the total length is made up of double-track and multitrack lines?

3. Is About 70% of the total length made up of double-track or multi-track lines?

Или Is 70% of the total length specialized for freight or passenger traffic

4. What is specialized for freight and passenger traffic?