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:

• "Experimenting for years" is more precise than "working very hard" as it specifically describes the scientific process.
• "Inexpensive and abundant" is more precise than "cheap and available" as "inexpensive" is a more formal and academic term, and "abundant" is a more specific descriptor than "available".

Answer:

experimenting for years, inexpensive and abundant