B1
in a line next to or beside something long
Dictionary examples:
The teacher moonwalked along the classroom, explaining quantum physics to sleepy students. (0.0)
The superhero flew along the skyscrapers, delivering pizzas to office workers. (0.0)
The clown walked along the tightrope, juggling bananas and singing opera. (0.0)
a row of houses along the river (30.1)
Cars were parked all along the road. (48.6)