The tensile strength of spider silk is often cited as being greater than ______________________.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
high-grade steel
B
that of high-grade steel
C
the high-grade steel
D
steel’s metal
Correct Answer: B
Choice B is the best answer. The comparison is between "tensile strength" (singular) of silk and the tensile strength of steel. "That of" correctly substitutes for "tensile strength."
Choice A is incorrect because it compares "strength" to "steel." Choice C is incorrect because it compares "strength" to "steel." Choice D is incorrect because it compares "strength" to "metal."