Which research question on the topic of air pollution is open-ended and complex? How many people believe that air pollution should be heavily regulated?
Which substances account for the greatest amount of air pollution?
How does air pollution affect human health in the United States?
Which counties in the United States experience the most air pollution?

"How does the air pollution affect human health in the US?"

Explanation:

"How many people believe that air pollution should be regulated?",

"Which substances account for the greatest amount of air pollution?",

and "Which counties in the US experience the most air pollution?"

all have a definite answer. "How does the air pollution affect human health in the US?", however asks what you think about the question and does not have a definite answer.

a) why did you buy only one bunch of bananas ? it's not enough for the party .

b) can i have a carton of juice, ? it looks very fresh !

c) a kilo of milk ? that's 2 pounds, .

d) i've got only one bar of chocolate . you can have a half of it .

e) cut just a small slice of cheese for me . i'm trying to lose weight .

f) do you want a bowl of soup ? it's delicious !

g) can i have a tin of biscuits, ?

h) do you want a loaf of bread ? i bought three .

i) let's buy a glass of wine to celebrate our wedding anniversary !

j) don't leave the jar of honey on the table . the kids will break it .

k) we need to buy some sweets and a bottle of coke .

l) would you like a cup of hot tea ? you've got a cold !

m) can i have a piece of chocolate cake, ? it's my favourite dessert .

n) i bought a beautiful packet of flowers for my mum's birthday .

hope this !

the author wants to draw the reader deeper into the experiences.