A:水杉 珙桐
B:鹅掌楸 梧桐
C:银杉 珙桐
D:银杉 梧桐
人体吸收的氧的最终去向是( )
估算4+15÷3的运算结果应在( )
— What did he _______ just now?— Sorry, I didn't catch his words. I_______ about something else.
图中具有稳定性的是( )