1

Problem

The understanding of cancer genomics was greatly expanded by Bert Vogelstein, a _ and doctor whose research on colorectal cancer has led to the identification of numerous genes associated with cancer and the development of new tools to diagnose cancer earlier.

Which choice completes the text?

2

Clue

Special attention to the facts and details draws out the main idea.

3

Hint

The main idea of the passage is analyzed and interpreted.

4

Sumup

Please summarize steps

Choices

6

Choice-A

Choice A is incorrect because the sentence is incomplete, making this punctuation incorrect.

Wrong scientist.

7

Choice-B

Choice B is incorrect because a comma should not be used here as it would create a comma splice.

Wrong scientist,

8

Choice-C

Choice C is incorrect because it places a semicolon after "scientist." A semicolon is used to link closely related independent clauses, but here the sentence is not yet complete, so a semicolon would be inappropriate.

Wrong scientist;

9

Choice-D

Choice D is correct, “scientist” fits because it pairs with “doctor” to describe Vogelstein’s professions, both serving as objects of the article “a.” No comma is needed, since “a scientist and doctor” is one continuous description, not separate clauses.

Correct scientist

10

Step

The text with the most logical and precise word - scientist

11

Answer

Option

D

12

Sumup

Please summarize choices