第10题: [单项选择]In the last paragraph (about 120) is in parentheses to show ________. A. that it is unimportant B. how many tribes there are C. that it is a large number D. how many people there are 参考答案:B 答案解析:[参考译文]在最后一段中，“大约120"在括号内是为了显示有多少部落。
[试题分析]本题测试的是根据上下文进行推断的能力。
[详细解答]文章是在最后一句话中提到“(大约120)”的…because
第21题: [单项选择]"Can you ride a horse" "No, I never had the chance ______. " A. for learning B. for learning how C. how to learn it D. to learn how 参考答案:D 答案解析:[试题分析] 此题考查不定式的用法。 [详细解答] 不定式作定语，用来说明被修饰的名词的内容。这个不定式相当于被修饰的那个名词的表语。这类名词常见的有：campaign，chance，cou
