After how many minutes does an average person repeat the sleep cycle
A. 8 to 15 minutes.
B. 30 minutes.
C. 40 to 60 minutes.
D. 80 minutes.
What can be inferred from the passage
A. Harlem was the poorest district in Manhattan.
B. White New Yorkers had no influence on Harlem's history.
C. All Blacks wished to settle in this promised land.
D. Harlem was highly regarded by Blacks.
免疫组织化学染色，淀粉酶阳性的涎腺肿瘤是
A. 多形性腺瘤
B. 嗜酸性腺瘤
C. 腺样囊性癌
D. 腺泡细胞癌
E. 粘液表皮样癌
某学龄儿，2月前患肾炎，近来抗“O”为500单位，血沉为6mm/h，尿红细胞7个/HP，患儿的活动范围是( )
A. 继续卧床休息
B. 可以上学，但应避免体力活动
C. 继续注射青霉素
D. 可参加体育活动不受限制
E. 仅限于室内活动或户外散步
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