在细胞质膜的组成中,胆固醇分子()。
A.仅存在于高等动物细胞中
B.仅存在于高等植物细胞中
C.高等动植物细胞中都存在
D.还未确定
参考答案:A
— What did your teacher say just now?
— He asked me this morning. [ ]
A. how did Tom come to school
B. when Tom got to school
C. why was Tom late for school
四川省横跨哪两个地区?[ ]
A、北方地区和南方地区
B、青藏地区和北方地区
C、青藏地区和南方地区
D、以上说法都不对