English Language · English
Which choice completes the text so that it conforms to the conventions of Standard English? Researcher Lin Zhi developed a process for increasing the tensile strength-measured in gigapascals, or GPa-of silkworm ______ dissolving and reweaving the silk in a solution of iron metal ions, zinc, and sugar, Zhi increased the amount of force required to stretch it from approximately 0.5 GPa to 2 GPa.
- 1silk, by
- 2silk by
- 3silk and by
- 4silk. By✓
Correct answer
silk. By
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