—Well. He ____ have gone far—his coat's still here.
A:shouldn't
B:mustn't
C:wouldn't
D:can't
计算:
(1)642713+(279)0.5﹣(8273+0.027-13)12
(2)log327﹣log33﹣lg25﹣lg4+ln(e2)+212log24
人的有酒窝与无酒窝是一对相对性状,有酒窝是显性性状(由显性基因A控制),无酒窝是隐性性状(由隐性基因控制ɑ).媛媛的爸爸和妈妈都有酒窝,而女儿媛媛无酒窝,请回答下列问题:
How many people died in the Bund tragedy in Shanghai on Dec. 31, 2014?
通常一种抗体只能对某一特定的病原体或异物起作用。(判断对错)