题干

右图是细胞膜的亚显微结构图,其中a和b分别代表不同分子或离子进出细胞膜的方式,下列对细胞膜结构和功能的叙述,错误的是 (  )

A:不同物种的细胞中①、②和③的种类存在差异

B:免疫抑制药物可作用于①而使器官移植的成功率明显提高

C:b的运输方式能体现细胞膜的选择透过性

D:如图示为小肠上皮细胞膜,则a可代表甘油,b可代表K+

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答案(点此获取答案解析)

A

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    Vandna loved sports and did well in her lessons at her high school in California. When a headache disturbed the 15-year-old girl's walk to class, she 1 it.

    “It was 2.” she thought, “Just a headache—harmless”

But when walking to her next class, she was 3 and collapsed to the floor. 4 she could hear other talking, she couldn't speak. She was 5 to the hospital in an ambulance. Tests indicated Vandna had a stroke affecting the right side of her brain, thus affecting the 6 side of her body.

    What was worse, the stroke caused her brain to began to swell, and she needed operation to 7 the pressure the swelling was putting 8 her brain. The doctors 9part of her skull(头骨)to make room for the swelling. 10 the swelling went down(消退), her skull was placed back again.

    While the doctors predicted that she would never live a normal life, Vandna 11 improved. She was in a rehab center(康复中心)for about 3 months and began to realize how 12 her daily life might be. She had to wear a brace(支架)on her left leg to support her 13. Her left arm 14 lightly, and she often became tired. Though 15 on a campus wasn't easy, she finished high school and 16 a degree in speech therapy at University of Redlands.

    After the stroke, Vandna became 17 with the American Heart Association. She shared her 18 at public events and urged others to stay 19. She said if you 20 a tough time, remember tough times don't last, but tough people do.