In metal work one advantage of adhesive-bonding over spot-welding is that the contact, and hence the bonding, is effected continuously over a broad surface instead of a series of regularly spaced points with no bonding in between.
A) instead of
B) as opposed to
C) in contrast with
D) rather than at
E) as against being at
OA : D
I didn't understand how option A or B is incorrect here. Having "at" before "a series..." as the right option is confusing me.
Can you please explain the logic and the concept?
if you don't have "at", then you wind up with over X and Y
-- implying both "over X" and "over Y".
the problem is that the resulting meaning is illogical here. think about the meaning of the sentence: you have a contrast between an application over a continuous surface
(in which "over" actually makes logical sense), on the one hand, and a different application at a series of (individual) points
, on the other hand.
the issue, then, is the meaning
of each preposition -- this is not a question about idioms.
when something happens at a single location
, "at" is used; it makes no sense to say that something happens "over" a single point (or several single points -- still ultimately the same issue).