Question

a student is writing a report for his science teacher about energy. read the draft of the report and complete the task that follows. scientists at the university of marylands energy research center have discovered a way to create a functional battery from a piece of wood. after working very hard/experimenting for years, they have created an energy source from materials that are both inexpensive and abundant/cheap and available. participants in the project believe that this battery could be a low - cost solution to the problem of limited energy in america. for each underlined pair of phrases, click on the phrase that is more precise. scientists at the university of marylands energy research center have discovered a way to create a functional battery from a piece of wood. after working very hard / experimenting for years, they have created an energy source from materials that are both inexpensive and abundant / cheap and available. participants in the project believe that this battery could be a low - cost solution to the problem of limited energy in america.

Explanation:

1. "Functional" precisely describes the nature of the battery. "Working very hard" is general, while "experimenting for years" specifies the method. "Inexpensive and abundant" is more scientific - sounding than "cheap and available". "Participants" clearly refers to those involved in the project.

Answer:

1. functional
2. experimenting for years
3. inexpensive and abundant
4. Participants