Section DListen to this mini-lecture on food, and answer the following questions.Questions 9 - 10. Fill in the gaps with ONE WORD from the mini-lecture. 9. Solar energy is problematic because the sun cannot always be relied on to Answer Question 7[input].

Question

Section DListen to this mini-lecture on food, and answer the following questions.Questions 9 - 10. Fill in the gaps with ONE WORD from the mini-lecture. 9. Solar energy is problematic because the sun cannot always be relied on to Answer Question 7[input].

BlackTom AI · Accepted Answer

Because the clause reads "cannot always be relied on to ___," the correct form is the base verb that completes the infinitive. In the context of solar energy, the lecturer is pointing out solar intermittency — the fundamental problem that solar power depends on whether sunlight is present. The simplest one-word completion that expresses that idea is shine.

Step-by-step reasoning:
1. Recognize the grammar pattern: "rely on to + [verb]" requires the base form of a verb after "to." That rules out gerunds like "shining" or past forms.
2. Use the content clue: the mini-lecture discusses solar energy’s limitations. The common phrasing for that limitation is that the sun does not always "shine" (for example, at night or during cloudy periods), which directly explains why solar energy is problematic.
3. Check one-word constraint: "shine" is a single word and fits both grammatically and semantically.
4. Consider alternatives: words such as "provide" or "generate" could also make sense in some sentences ("sun cannot always be relied on to provide [energy]"), but the typical, concise lecture phrasing emphasizes the physical fact — "the sun cannot always be relied on to shine." "Shining" (the gerund/participle) would be ungrammatical after "to" in this construction; "be" is too vague.

Why this is correct:
- It directly expresses the intermittency problem (nighttime, weather) in the usual idiom.
- It fits the required one-word answer and the grammar of "rely on to + verb."

Therefore the correct fill-in is shine, which matches the provided answer.

Section DListen to this mini-lecture on food, and answer the following questions.Questions 9 - 10. Fill in the gaps with ONE WORD from the mini-lecture. 9. Solar energy is problematic because the sun cannot always be relied on to Answer Question 7[input].简答题

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