单项选择题

We can infer from the speech of the study leader that ______.

A．the research helps to answer really big questions about lightning
B．runaway breakdown is a mechanism that may play a role in gamma-ray flashes
C．the next research might be on "runaway breakdown"
D．the researchers have a lot to learn about how even small sparks work
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单项选择题
Vocabulary activation when first quickly glancing at the text is important because
A．the brain will begin to focus on related concepts so that students can prepare some words to be read in the text
B．the brain will prepare the students to read the articles
C．the brain will begin to concentrate on related concepts to prepare the students for what is to be read
D．the students will begin to prepare themselves to read each word in the text
单项选择题
What kinds of contextual clues are mentioned in the passage
A．Part of speech, "chunking", vocabulary activation, and logical deduction.
B．Part of speech and vocabulary activation.
C．"Chunking", part of speech and vocabulary activation.
D．"Chunking", vocabulary activation and logical deduction.
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