—The final round of the competition is coming near. Can I really do well this time?—Believe in ______. You're always the best in our school.
A:you
B:your
C:yours
D:yourself
关于染色体、DNA、基因三者的叙述中错误的是( )
李斯在《谏逐客书》中说:“孝公用商鞅之法,移风易俗,民以殷盛,国以富强,百姓乐用,诸侯亲服。获楚魏之师,举地千里,至今治强。”这段材料不能说明 ( )
下列各式成立的是( )
函数f(x)=2sin(π4-x)cos(π4+x)-1,x∈R是( )