What do we know about extracurricular activities in American high schools?
A.Students are united and work to reach the same goal.
B.There still exists prejudice and race discrimination.
C.Students from different races have equal access.
D.They are organized according to Allport's Theory.
第9题
下列慢性腹泻的病因中属于感染性因素的是
A.溃疡性结肠炎
B.缺血性肠炎
C.憩室炎
D.肠结核
E.克罗恩(Crohn)病
第10题
X线钡剂跳跃征见于
A.溃疡性结肠炎
B.克罗恩病
C.溃疡性肠结核
D.增生性肠结核
E.溃疡性结肠炎
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