某竣工验收合格的引水渠工程，初期通水后两岸坡体出现了很长的纵向裂缝，并局部地面下沉，该地区土质可能为（）。
A. 红黏土
B. 软岩
C. 砂土
D. 湿陷性黄土
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豆类的蛋白质含量是( )
A. 10～30％
B. 20～40％
C. 30～50％
D. 40～60％
According to the passage, the highest amount of pheromone vapor is found（）
A. in the receptors of the ants
B. just above the trail
C. in the source of food
D. under the soil along the trail
According to the passage, what responsibility does the audience of a verbal art performance have（）
A. They provide financial support for performances
B. They judge the quality of the content and presentation
C. They participate in the performance by chanting responses
D. They determine the length of the performance by requesting a continuation
What is tile main point of the second paragraph（）
A. Public performance is essential to verbal art
B. Oral narratives are a valid form of literature
C. Native Americans have a strong oral tradition in art
D. The production of literature provides employment for many artists
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