With the development of modern industry, there will be ___ living space for wild animals.
A:fewer and fewer
B:less and less
C:more and more
D:bigger and bigger
写出心脏各部分名称.
①____;②____;③____;④____;⑤____;⑥____;⑦____.
下列四组图,正确反映违法与犯罪关系的是( )
如图所示,电源、滑动变阻器与螺线管相连,闭合开关,在通电螺线管的右端放置一个小磁针,小磁针静止时N极水平向右.则( )
数数木块的个数,有____块.