In B, the best choice, older than makes this point of comparison clear. B also correctly uses the adjective supposed, rather than the adverb supposedly used in D and E, to modify the noun phrase Mediterranean predecessors.
Answer to Question 6
Although an -ing verb such as trying can sometimes be used as a noun, the phrase the organisms trying to metabolize in A is unidiomatic because trying is used as the object of organisms.
In B, trying that it metabolize is ungrammatical. The noun attempt could follow organism also, it would parallel the noun enzymes, and parallelism is needed here because the sentence uses the linking verb are to equate enzymes and attempt.
In C and D, however, attempt to try is redundant. Choice E, which says attempt to metabolize, is best. The phrase the chemical irritant is also the most concise and precise conclusion for the sentence because it clearly refers to the dioxin mentioned earlier.
Answer to Question 7
The best choice is C. The phrase the more the children should be completed by a parallel phrase that begins with a comparative adjective and a noun phrase, as in the greater their... advantage. Only C correctly completes the structure with a parallel phrase.
Choices A. B, D, and E present structures that are unwieldy and awkward in addition to being nonparallel, and that state the relationship between language use and skills development less clearly than C does. Also, underlaying in B and underlay in D are incorrect; the meaning of this sentence requires the present participle of underlie, underlying, as a modifier of skills.
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