听力原文:M: Ruth seems very unhappy today.
F: She failed to answer the teacher’s question in class.
Why is Ruth unhappy today?
A.She forgot to do her homework.
B.She didn’t pass a test.
C.She couldn’t answer her teacher’s question.
第7题
毛囊蠕形螨与皮脂蠕形螨的主要区别是
A.皮脂蠕形螨末体较长,尾端尖
B.毛囊蠕形螨末体较长,尾端尖
C.两者无区别
D.毛囊蠕形螨末体较长,尾端尖
E.毛囊蠕形螨末体较短,尾端钝
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