A:①②⑤
B:②③④
C:②③
D:①②③
商鞅变法的主要内容是什么?
_______ right after meals is bad for our health.
有关人类精子细胞、体细胞中染色体数目的表达,正确的选项是( )
—You bought the computer about nine years ago?
—Yes. _______ it's old, it still works well.