Answer: <em>B and D </em>
My cousins care too much about appearances, and my cousins drive me crazy.
Explanation:
The correct answer is 1. One idea.
Always keep just one idea on note cards when doing research to prevent jumping from topic to topic and from question to question thus making it incoherent and incohesive.
Explanation:
Hyperloop is an ultra-high-speed ground transportation system for passenger and cargo proposed as a concept by Elon Musk, CEO of Tesla and SpaceX, in a white paper back in 2013. It consists of partially evacuated tubes and passenger or cargo pods moving at very high speeds.