有高热，腹痛，子宫压痛者（）。
A.卵巢肿瘤蒂扭转
B.急性盆腔炎
C.宫外孕
D.阑尾炎
E.卵巢巧克力囊肿
参考答案：B
18．--- Tom has a lot of parties recently.
---Yes, that may ____ why he didn’t do well in the test.
A, sum up B. add up to C. account for D. make sense of
皮尔逊Ⅲ型概率密度曲线有何特点？
