—Many students don't know how to____ stress and become worried.
—I think they should ask their parents for help.
A：deal with
B：get on
C：care for
在生殖系统的下列结构中，能产生性激素和生殖细胞的一组是（ ）
染色体主要是由____和____组成的，其中____是主要的遗传物质。
