The asphalt at La Brea seeps to the surface, especially in the summer, and forms shallow puddles that would often have been conc

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问题 The asphalt at La Brea seeps to the surface, especially in the summer, and forms shallow puddles that would often have been concealed by leaves and dust.

选项 A、highlighted
B、covered
C、transformed
D、contaminated

答案B

解析 在拉布霄亚地区,沥青渗漏到地表。尤其是在夏天,形成的浅水坑往往被树叶和灰尘掩盖。A项highlighted “v. 突出,强调”。B项covered “v. 覆盖”。C项transformed “v. 转变”。D项contaminated “v. 污染,弄脏”。
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