The article doesn't say how the study was conducted or what the collected data was. It just gives an interpretation.

It says that 35% chose to purchase a hybrid again. So are we to assume that the others purchased something else? It doesn't say that. How many of the remaining 65% chose to not buy a new car at all?

The article doesn't say how the study was conducted. Was some of the data collected at dealerships that don't sell hybrids?

Does the study consider only new car buyers, or does it include people buying clunkers? Because clunker-buyers might not know or care whether a clunker is hybrid.

By and large, hybrid owners love their hybrids. You know who doesn't like hybrids? Outdated automobile manufacturers who don't have the technological prowess to develop them. They wouldn't be behind a phony study/article, would they?

Two lines are perpendicular if they meet at a right angle. If they don't meet, they aren't perpendicular. So question (i) on the Chinese national test is ill-formed. I prefer the British test. It looks like the people who wrote the Chinese test were trying to make too complicated a question, and got confused themselves. Maybe something got lost in translation. You could guess that they meant that any non-zero vector along BD is perpendicular to any non-zero vector along A1C, but if that's what they meant, they could have said so.