the young spend most of their free time going shopping
Going shopping and spending their free time at the shopping mall are 2 different activities. The writer was confused by the phrase
much of their free time at shopping malls
This could mean any activity ranging from shopping, going to the game center, watching a movie, and a host of other activities. It does not automatically translate as "going shopping". While that is the common thought that comes to mind when one hears of a shopping mall, the reference should have been more in general reference as in the original. For example: "spend most of their free time doing activities at the mall." This would be more aligned with the original statement of spending free time at the mall. The writer has thus, misrepresented the original thought and its subject reference.
for those reasons that will be discussed below.
The writer provided a clear statement, but did not provide any topical reference to support his claim. The supporting topic subjects mentioned at the end would have provided a clear thesis statement in support of his opinion. Doing so would have concretely established his opinion as needed for the strength of this paragraph restatement.
teenagers waste much money on unnecessary commodities.
Again, the discussion reference focuses only on shopping as the discussion point. The activities that the mall goers spend on are varied and expansive. The writer must not focus only on shopping because th
at is only one of many activities. Rather than a focused discussion, this should be a general discussion covering various mall activities instead. This is a weak argument due to the incorrect focus.
The second paragraph is more acceptable in the social sense. The problem with this presentation is the sudden change of discussion focus with the closing sentence being :
It is not a surprise that the gap between the rich and the poor is bigger, the rich are still rich and the poor are still poor.
That is a totally unrelated reference point and should not be included in the discussion. It alters the discussion topic from the original.
going shopping
Again, the focus is not on shopping but on spending time at the mall. The test taker has misunderstood the requirements of the discussion.