A:《门外青山》
B:《命若琴弦》
C:《我与地坛》
D:《合欢树》
I still consider Jack as one of my best friends though ______ he did caused some ______ to his fame.
下列说法正确的是( )
H2、O2和N2的混合气体20g点燃,充分反应后生成18g水,则剩余气体不可能是( )
9×( )<35,括号内最大数字应填( )