—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
①认识能否达到最终目的受到特定社会历史条件的制约
②现代科技手段的运用推动了有关恒星团认识的深化发展
③人类的好奇心是推动科学研究深入发展的源泉和动力
④理论完善和认识能力的提高是科学实践成功的首要因素
酵母菌与细菌相比,在结构上主要不同是有成形的细胞核(判断对错)