下列关于性染色体的叙述,正确的是( )
A:性染色体上的基因都可以控制性别
B:性别受性染色体控制而与基因有关
C:女儿的性染色体必有一条来自父亲
D:性染色体只存在于生殖细胞
如果集合M={y|y=sinxsinx+cosxcosx,x≠kπ2,k∈Z},则M的真子集个数为( )
—______ is the book shop?
—It's near the school.
His cousin hardly has vegetables these days, __________?