Hevea brasiliensis, a tree in the Amazon rainforest, is the world’s main source of natural rubber. The tree produces a milky substance called latex that is used to make rubber. The bark of Hevea brasiliensisis helpful for the process of making rubber because it has a unique structure that makes it easy to collect latex. A network of tubes in the tree’s inner bark helps the latex to flow out easily when people make small cuts into the bark. What feature of Hevea brasiliensisdoes the text say is helpful for the process of making rubber?
","rationale_html":"Choice B is the best answer because it most accurately states what feature of Hevea brasiliensis is helpful for the process of making rubber. According to the text, this tree species produces latex, which is used to make rubber, and its inner bark contains a “network of tubes” that, when cut, enables the latex to flow out. The text explicitly states that this feature of Hevea brasiliensis is “helpful for the process of making rubber.” Choice A is incorrect because the text doesn’t mention the quality of the rubber produced from the latex of Hevea brasiliensis or compare its quality to that of rubber produced from other sources. Choice C is incorrect because the text never discusses the climates in which Hevea brasiliensis grows. Moreover, the text mentions only one region where this tree is found: the Amazon rainforest. Choice D is incorrect. Because the text states that Hevea brasiliensis is the world’s “main source of natural rubber,” it can be inferred that there is at least one other source. However, the text doesn’t specify whether that other source is also a tree species and, if so, whether that species grows in the Amazon rainforest.
","correct_answer":["B"],"has_media":false,"has_mathml":false,"has_table":false,"source_created_at":null,"source_updated_at":null,"options":[{"label":"A","content_html":"Its latex produces rubber of an especially high quality.
","ord":0},{"label":"B","content_html":"Its bark has a unique structure that makes it easy to collect latex.
","ord":1},{"label":"C","content_html":"It is able to grow in a wide variety of climates around the world.
","ord":2},{"label":"D","content_html":"It is one of only two trees in the Amazon that produce latex.
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