某些逆转录病毒所含有的能够转化细胞的____________称为病毒癌基因。
参考答案:DNA片断
已知y关于x的一次函数y=(m﹣4)x+3﹣m的图象经过点A(2,﹣4).
(1)求这个一次函数的关系式.
(2)该一次函数的图象也经过点B(﹣1,b),求b的值.
(3)建立直角坐标系,画出这个一次函数的图象,设一次函数的图象与y轴交于点C,求△BOC的面积.
In addition to his traditional medical treatment, he tried to put himself in situations______ would bring about positive emotions.
A.which
B.where
C.why
D.as