下列关于物质跨膜运输的叙述，正确的是（）
A．葡萄糖分子进入所有真核细胞的方式均相同
B．在肺中交换气体时，氧气可以从低浓度扩散到高浓度
C．甘油进出细胞取决于细胞内外的浓度差和载体的数量
D．细胞通过主动运输方式吸收离子的速率与细胞呼吸强度呈正相关
参考答案：D
解析：葡萄糖分子进入红细胞是协助扩散，进入其他细胞一般是主动运输，A错误；氧气运输是自由扩散，只能从高浓度到低浓度扩散，B错误；甘油进出细胞是自由扩散，C错误；细胞通过主动运输方式消耗能量，吸收离子的速率在一定范围内与细胞呼吸强度呈正相关，D正确。考点：本题考查物质运输的知识。意在考查能理解所学知识的要点，把握知识间的内在联系的能力。
| 选择合适的单词填空，填序号。 | ||
| Mary is a little girl. She is only five. She __1__ go to school. She doesn't know how to read 2__ write. But her sister Joan is a school girl. She is ten. She 3 how to read 4 write. One day, Joan sees her little sister in the study. She is at the table. There 5 a pencil in her hand. She is __6 something there. " 7 are you writing, Mary?" she asks. ''I'm writing _ 8 my friend Rose." "But how can you do it? You don't know __9 to write."says her sister. "Well. It doesn't matter. Rose doesn't know how to read, 10 ." | ||
( ) 1. A. don't | B. aren't B. or B. knows B. or B. is B. writing B. When B. in B. how B. to | C. doesn't C. of C. knowing C. of C. are C. writes C. What C. with C. where C. two |