Which of the following is the manifestation of Down syndrome? A: Mental retardation B: Low muscle tone C: Single palmar crease D: All above

The child may get confused at hearting the color of white used for paper when he/she first thought it as the word for snow. This is an example for _______. A: Over-extention B: Mental retardation C: Under-extention D: Hearing impairment

Common nutritional problems for infants and young children include? A: iron deficiency anemia B: Growth retardation caused by zinc deficiency C: deficiency caused by vitamin D rickets D: Osteomalacia caused by calcium deficiency

Which of the following can be inferred from the passage A: After five years of intensive treatment, Adam has completely recovered. B: Mental retardation can result in autism. C: Parents should know some key symptoms of autism so that they can spot the disorder. D: Diagnosing autism in children is not difficult.

下列不属于细胞凋亡检测方法的是（） A: DNA断裂的原位末端标记法 B: 流式细胞仪检测凋亡的亚二倍体细胞 C: 凝胶延滞实验（gel retardation assay） D: Annexin V识别暴露在细胞膜外侧的磷脂酰丝氨酸

6. 下列不属于细胞凋亡检测方法的是 A: A. DNA断裂的原位末端标记法 B: B. 流式细胞仪检测凋亡的亚二倍体细胞 C: C. 凝胶延滞实验（gel retardation assay） D: D. AnnexinV识别暴露在细胞膜外侧的磷脂酰丝氨酸