A:53
B:35
C:A53
D:C53
设a,b,l均为不同直线,α,β均为不同平面,给出下列3个命题:
①若α⊥β,a⊂β,则a⊥α;
②若α∥β,a⊂α,b⊂β,则a⊥b可能成立;
③若a⊥l,b⊥l,则a⊥b不可能成立.
其中,正确的个数为( )
动物生来就有的,由动物体内的遗传物质所决定的行为叫做____.
The thief who was caught stealing on the bus couldn't ______ the fact that the passenger's purse was found in his pocket.