護理師與 2 歲幼兒家長討論發展里程碑，下列哪些行為是典型的？（選所有適合的）
A nurse is discussing developmental milestones with a parent of a 2-year-old. Which behaviors are typical? (Select all that apply.)
- AWalking up and down stairs holding onto a rail✓ 正解扶著欄杆上下樓梯
- BUsing 2-3 word phrases✓ 正解使用 2-3 個詞組成的短句
- CPlaying with other children in a cooperative manner以合作方式與其他兒童玩耍
- DShowing signs of temper tantrums✓ 正解出現脾氣暴怒的跡象
- ERiding a bicycle騎自行車
2 歲幼兒正處於自主性發展階段（Erikson 的 Autonomy vs. Shame and Doubt）。此階段生理特徵包括粗大動作的進步（如扶手上下樓梯）與語言發展的爆發（使用雙詞句）。同時，因情緒調節能力尚未成熟，常出現「情緒暴躁（Temper tantrums）」，這是典型的發展過程表現，家長需學習正向引導。
A 2-year-old toddler is in the autonomy stage of development (Erikson's Autonomy vs. Shame and Doubt). Physiologic characteristics of this stage include advances in gross motor skills (such as climbing stairs while holding a rail) and an explosion in language development (using two-word phrases). At the same time, because emotional regulation is still immature, temper tantrums are common and represent typical developmental behavior; caregivers need to learn positive guidance strategies.