—Do you want to keep goldfish?
—No, they are ______ difficult for me______ take care of.
A:so; that
B:not; enough to
C:too; to
D:such; that
下边漫画《不偏不倚,大步流星》告诉我们( )
关于作用力与反作用力,下列说法中正确的有( )
设计一个实验证明声音具有能量.写出需要的器材和相应的步骤.
关于温度、热量、内能,以下说法正确的是( )