If you go back to this lesson, you'll see some advice about "developing the overview". The idea was that you write two sentences in your overview paragraph, and then you write each 'details' paragraph (3 and 4) by developing one of these overview sentences.
I'm calling this 'super cohesion' because it creates a very logical and connected structure. There is cohesion across the paragraphs, as well as within them.
I tried the same technique when I wrote last week's task 1 answer. Here it is again, with the 'super cohesion' highlighted:
The bar chart illustrates the frequency with which Americans ate in fast food establishments from 2003 to 2013.
It is clear that the majority of Americans ate in fast food restaurants between once a week and once a month in all three years. We can also see a shift towards eating in these restaurants less frequently by the end of the 10-year period.
In each of the years shown on the chart, close to 60% of people in the US ate in fast food restaurants between once and four times a month. Roughly 15 to 20% of Americans reported eating in fast food outlets several times per week, while 3 to 4% of people ate in these outlets daily. At the other end of the scale, around 4% of people avoided fast food restaurants completely.
Between 2006 and 2013, the total proportion of Americans who ate in fast food establishments either once a week or several times a week fell by almost 10%. At the same time, there was an increase of around 8% in the ‘once or twice a month’ category. In other words, the weekly fast food habit that was common in 2003 and 2006 became a monthly or twice monthly habit in 2013.
Can you see what I've done? The first sentence of the overview (green) is developed in paragraph 3, and the second sentence of the overview (blue) is described in more detail in paragraph 4.
Tip: Try reading all of the 'green' sentences together, then read the 'blue' sentences separately. This should help you to see how the overview and main paragraphs are connected.