第26题: [单项选择]防止流砂的主要措施有( )。 ①降低地下水位;②地下连续墙法;③水中挖土;④枯水期施工;⑤消除动水压力。 A. ①②④ B. ①③⑤ C. ①②③④⑤ D. ②③④⑤ 参考答案:C 答案解析:[解析] 降低地下水位、消除动水压力是防止产生流砂现象的重要措施。具体可采用的措施有:枯水期施工、水下挖土、人工降低地下水位、地下连续墙法、搅拌桩支护、抛大石块等
第30题: [单项选择]{{B}}Passage One{{/B}}
{{B}}Questions 26 to 29 are based on the passage you have just heard.{{/B}} A. A painter and a sculptor. B. Paintings inspired by photographs. C. Early photographic techniques. D. The work of two photographers. 参考答案:D 答案解析:[听力原文]26-29
In this century, photographs have been really important for teaching art history. I