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Question

Difficulty: EasyEstablishing Introductions and Thesis Statements

[1] Fleming returned to his laboratory after a vacation to find that a mold called *Penicillium notatum* had contaminated one of his petri dishes. To his surprise, the bacteria immediately surrounding the mold had been destroyed. This chance discovery revolutionized modern medicine, leading to the development of antibiotics that have since saved millions of lives.

Which choice most effectively introduces the paragraph?

  1. A
    Because he returned to his laboratory after a vacation in 19281928.
  2. B
    Although laboratories are usually clean, Fleming's laboratory is disorganized, leading to a strange mold.
  3. In 19281928, Alexander Fleming made a discovery that would change medicine forever.Answer
  4. D
    Many scientists worked in laboratories, they often made discoveries by accident.

Answer

In 19281928, Alexander Fleming made a discovery that would change medicine forever.
The correct option is a complete, grammatically sound sentence that effectively introduces the main focus of the paragraph: Alexander Fleming's discovery and its impact on medicine.

Step-by-Step Solution

1
Identify the main focus of the paragraph by reading the sentences that follow the introduction.
The paragraph details Alexander Fleming's discovery of a mold that killed bacteria, which led to modern antibiotics.
An effective introduction must establish the subject of the paragraph.
2
Evaluate the choices for grammatical correctness.
One choice is a dependent clause fragment; another shifts verb tenses incorrectly; a third contains a comma splice.
An introductory sentence must adhere to the rules of standard written English grammar.
3
Select the choice that is both grammatically correct and introduces the passage's main focus.
The choice stating that Fleming made a discovery in 19281928 that would change medicine forever fits all criteria.
It acts as a complete, correct sentence that perfectly sets up the paragraph's subject.

Key Concept

Establishing paragraph introductions
Estimated Time:1m 0s
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Topics

Establishing Introductions and Thesis Statements

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