Which one of the following most accurately expresses the main point of passage B?

Shiyi on February 17 at 01:23PM

Why is C correct?

Why is C correct? Why is A incorrect?

1 Reply

Ravi on February 18 at 10:44PM

@Shiyi-Zhang,

Happy to help.

The question asks, "Which one of the following most accurately
expresses the main point of passage B?"

In reading Passage B, the main point is at the start of the third
paragraph of the passage (lines 53-58) when the author states, "We are
now living through a great paradigm shift in the field of computing, a
shift from sequential computing (performing one calculation at a time)
to massive parallel computing, which employs thousands of computers
working simultaneously to solve one computation-intensive problem."

In Passage B, the author's overall conclusion is that we are shifting
from a type of computing that was focused on individual computers to
one that focuses on using many different computers working together
with one another. The author agrees with this approach because lots of
computer problems are inherently parallel. Since lots of these
problems are inherently parallel, the former way of sequential
computing is far too slow to solve these more complex problems.

You asked why (A) is incorrect. Let's take a look.

(A) says, "Many difficult problems in computing are naturally parallel."

The problem with (A) is that it's not the main point of Passage B;
rather, it's a premise that the author of Passage B uses to support
her conclusion. The reason we are transitioning to parallel computing
is because many difficult problems in computing are naturally
parallel. Since the question is asking us for the main point—and this
answer choice is a premise—we can get rid of it.

(C) says, "There is currently a paradigm shift occurring in the field
of computing toward parallel computing."

As noted above, the main point of Passage B is the first sentence of
the third paragraph, where the author discusses the paradigm shift
heading toward parallel computing. (C) does a great job in
paraphrasing the first sentence of the third paragraph for us, so it's
the correct answer choice.

Does this make sense? Let us know if you have any more questions!