The nurse instructs the female client concerning hormone replacement therapy for menopausal symptoms. Which of the following points should the nurse include in the client’s teaching plan

A. Estrogen therapy eliminates the need for supplemental calcium intake.
B. Estrogen therapy can reduce the risk of menopausal bone loss.
C. The risk of uterine cancer is decreased after menopause.
D. Smoking is associated with a later onset of menopaus

我国有9600000平方千米领土，用科学记数法可表示为______；近似数3.25×10⁴有______个有效数字．