sat-dog

← Back to browse

Hard Reading and Writing · Standard English Conventions · Form, Structure, and Sense · MCQ

Known as Earth’s “living skin,” biocrusts are thin layers of soil held together by surface-dwelling microorganisms such as fungi, lichens, and cyanobacteria. Fortifying soil in arid ecosystems against erosion, ______blank

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A

    a recent study’s estimate is that these crusts reduce global dust emissions by 60 percent each year. 

  2. B

    an estimated 60 percent reduction in global dust emissions each year is due to these crusts, according to a recent study.

  3. C

    these crusts reduce global dust emissions by an estimated 60 percent each year, according to a recent study.

  4. D

    a recent study has estimated that these crusts reduce global dust emissions by 60 percent each year.

Source: SAT practice questions © College Board, from the official SAT Suite Question Bank. Retrieved via the community dump at github.com/mdn522/sat-question-bank. View the official question bank →

SAT® and PSAT/NMSQT® are trademarks registered by the College Board, which is not affiliated with, does not sponsor, and does not endorse this project.

id cb_question_bank:51ad2efd-ef81-45ea-b74a-3684ac6bdf86 · question dab8b8ee · JSON