题目

阅读短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。Skiing has always been a big part of Kamikaze shiffrin's life. Her dadski raced all through college and her mom raced and coached skiing. TheSiffrins taught Mikaela and her brother, Taylor. To ski at a very young age. Attwo and a half years old, Mikaela made her first ski run down her driveway onplastic skis.Mikaela loved skiing. From ages 8 to11, she did hundreds of trainingruns on small hills to learn the skills of slalom skiing (障碍滑雪). When Mikaela was11, she began to learn at the Burke Mountain Aca杂交水稻之父袁隆平成功培育出高产杂交水稻这是利用了生物多样性中的   （   ）A．生物种类的多样性B．基因的多样性C．生态系统的多样性D．生态环境的多样性