单项选择题
能激活糜蛋白酶原的物质是（）
A.肠激酶
B.HCl
C.内因子
D.胆盐
E.胰蛋白酶
能激活糜蛋白酶原的物质是（）
A.肠激酶
B.HCl
C.内因子
D.胆盐
E.胰蛋白酶
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单项选择题
Refer to Table 2.1. To maximize total production,
Refer to Table 2.1. To maximize total production,
A．Krystal should specialize in writing TV commercials, and Mark should specialize in writing poems.
B．Mark should specialize in writing TV commercials, and Krystal should specialize in writing poems.
C．Krystal should write poems and write TV commercials, but Mark should only write poems.
D．Krystal and Mark should both split their time between writing poems and writing TV commercials.