It was late. She opened the door ________ because she didn't want to wake up her grandma.
A:angrily
B:quietly
C:loudly
D:heavily
以下不属于我国为保护生物多样性而采取措施的是( )
在铁的氧化物和氧化铝组成的混合物中,加入2mol/L硫酸溶液65mL,恰好完全反应.所得溶液中Fe2+能被标准状况下112mL氯气氧化.则原混合物中金属元素和氧元素的原子个数之比为( )