下列那一项不是系统性红斑狼疮的病因
A．紫外线
B．遗传
C．易感基因
D．雌激素
E．孕激素
参考答案：E
作为亲本自交系必须具备哪些条件。
My aunt _____ me to play the violin when I was a child. [ ]
A. taught
B. teach
C. teaches
D. will teach
