9.B be believed to 表示“确信”。 10.A concerned about 指“忧虑、担心”，而concerned with 是指“关心、感兴趣”。
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b be believed to
be believed to相信;
以上为机器翻译结果，长、整句建议使用 人工翻译 。
People with type B blood are believed to be stubborn, impulsive and cold, although they are also seen as practical, and Matsumoto's explanation was greeted with derision .
B型血的人虽然比较务实，但性格顽固、冲动、冷漠。 松本龙的这一解释引来了嘲笑。
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Each marathon course was approximately twenty-five miles, believed to be the length of the route from Marathon to Athens run by Pheidippides in 490 B.
NEWYORKER: Glory Days
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