无色的胆色素是 A．胆绿素 B．尿胆素 C．胆红素 D．粪胆素 E

Which of the following statements about demand and consumer choice is least likely correct（）

A. The elasticity of demand for a good increases over time.

B. In the short run, if the price of gasoline increases, consumption of gasoline will decrease by a smaller percentage.

C. In the short run, if the price of a brand of flour increases, consumption of that brand of flour will decrease by a smaller percentage.

非易燃品的闪点在（）。

A.60℃

B.50℃

C.40℃

D.60℃以上

可诱导前T细胞转变为T细胞

A．白细胞介素
B．左旋咪唑
C．干扰素
D．转移因子
E．胸腺素

某供求曲线为一条通过原点的直线，该价格弹性（）。

A、等于零

B、等于斜率

C、等于1

D、不能确定