Question

a. read the sentences below. pay attention to the verbs because they indicate what a person is doing on the computer. complete the idea by filling in the appropriate missing vocabulary word or expression. rafael está navegando ∆ symbols . está buscando un ∆ symbols sobre los problemas ecológicos en méxico.

Explanation:

The sentence "Rafael está navegando ____ sobre los problemas ecológicos en México" (Rafael is browsing __ about ecological problems in Mexico) likely needs a noun related to browsing information, like "la web" (the web) or "internet" (internet). But considering common phrasing, "la web" or "internet" fits. Wait, maybe "información" (information)? Wait, no, the context is browsing on the computer, so "en la web" or "sobre la web" no, the blank is after "navegando". Wait, "navegando" (browsing) + "por la web" or "sobre la web" but the structure here: "navegando __ sobre los problemas..." Wait, maybe a typo, but the correct phrase for browsing about a topic on the computer is "navegando por la web" or "navegando en internet" or "navegando información" (but that's less common). Wait, maybe the intended answer is "en la web" or "sobre la web" but the blank is a single word? Wait, maybe "la web" or "internet". Alternatively, "documentos" (documents). But given the context of ecological problems, maybe "información" (information) or "la web". Wait, perhaps the correct word is "la web" (the web) or "internet". But let's check the structure: "Rafael está navegando [blank] sobre los problemas ecológicos en México". The preposition "sobre" (about) is after the blank. So "navegando" + [blank] + "sobre...". So the blank should be a noun that fits with "navegando" (browsing) and "sobre" (about). So possible answers: "la web" (the web), "internet" (internet), "información" (information), "documentos" (documents). But the most common is "la web" or "internet". Wait, maybe the answer is "la web" (the web) or "internet". Alternatively, "en la web" but the blank is a single word? Maybe "web" (web) or "internet". But in Spanish, "navegar por la web" is common, but here the structure is "navegando ____ sobre...", so maybe "sobre la web" no, the blank is between "navegando" and "sobre". So "navegando [blank] sobre..." So the blank is a noun, so "la web" (the web) would be "navegando la web sobre...", but that's not correct. Wait, maybe "sobre" is a typo and should be "en", but no. Alternatively, "navegando información sobre..." (browsing information about...). So "información" (information) could be the answer. But I think the intended answer is "la web" (the web) or "internet". But given the options (if any), but since it's a fill-in, the most probable is "la web" or "internet". Wait, maybe the correct word is "la web" (the web) or "internet". Alternatively, "documentos" (documents). But I'll go with "la web" as a common phrase for browsing on the computer about a topic.

Answer:

la web (or internet, or información; most appropriately "la web" in this context)