题干

如图表示细胞膜的亚显微结构,其中a和b为两种物质的运输方式,有关叙述正确的是(    )

A:不同物种的细胞中①、②和③的种类均不同

B:a物质进入细胞的方式是简单扩散,b物质进入细胞的方式是主动运输

C:若图示为红细膜,则a可代表O2,b可代表葡萄糖

D:该图可以表示细胞内的其他生物膜结构

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答案(点此获取答案解析)

B

同类题1

阅读理解。

    One day, I received a call from a colleague. He was about to give a student a zero for his answer to a physical problem, while the student claimed a perfect score. I was elected as their arbiter(仲裁人). I read the examination problem: “Show how it is possible to determine the height of a tall building with the aid of a barometer(气压计). ”The student had answered; "Take the barometer to the top of the building, attach a long rope to it, lower it to the street, and then bring it up, measuring the length of the rope. The length of it is the height of the building.”

    The student had really answered the question completely, but the answer didn't confirm his competence in physics. I suggested the student try again. I gave him six minutes to answer the question, warning that the answer should show some knowledge of physics. Five minutes later, he said he had many answers and dashed off one, which read:“Take the barometer to the top of the building and lean over the edge of the roof. Drop the barometer, timing its fall with a stopwatch. Then, use the physical formula(公式)to calculate the height of the building.”

    At this point, my colleague had to accept it, and then the student made almost full marks. I couldn't help asking the student what the other answers were. He listed many others, and then added, "Probably the best is to take the barometer to the administrator and said to him, ‘Sir, here is a fine barometer. If you tell me the height of the building, I will give it to you.”,

    Then, I asked the student if he really did not know the conventional answer to this question. He admitted that he did, but said that he was fed up with high school and college instructors trying to teach him how to think.

    The name of the student was Bohr who later was famous all over the world. He won the Nobel Prize for Physics in 1922.