<p>The charm of Lofting's book lies in the humorous reversal of roles-the animals guide, assist, and generally they take care of the help humans. No error</p>
<p>Could "they" refer to "roles"?</p>
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<p>The construction of a waterway linking the Atlantic and Pacific Oceans was first proposed in 1524, but not until the Panama Canal opened in 1914 did such a project become a reality. No error</p>
<p>Don't you think "become a reality" is redundant and should be changed into "become real"?</p>
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<p>Several of Frank Stella's paintings were inspired by the shapes of waves and whales, titled after chapter headings from Moby-Dick.</p>
<p>a. paintings were inspired by the shapes of waves and whales, titled
b. paintings, inspired by the shapes of waves and whales, are titled</p>
<p>Why the answer is b but not a?</p>
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<p>In the past, many famous painters meticulously ground their own colors, an attention to detail that is noteworthy.</p>
<p>a. an attention to detail that is noteworthy
b. an idea that is noteworthy in showing their attention to detail.</p>
<p>Why the answer is a? I can't understand.</p>
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<p>Thanks.</p>