What does the word "altruism" in Paragraph Two mean？A．The quality of being optimisticB．The

What does the word precursor in the context in the second paragraph mean？

What does the word "defensive" mean in the passage？ 查

What does the word " That" refer to in the last sentence in Paragraph 6？A．The troubling bu

What does the author mean by $quot;What does the author mean by "context"？<br/>A．It refers to long-term memory.<br/>B．It refers to a new situation.<br/>C．It refers to a store of knowledge.<br/>D．It refers to the search engine.<br/

What does the word "integration" in the last paragraph probably mean？A．Host countries coop

What does the word“bottlenecks”(Para.2)mean in th