A publisher is now providing university professors with the option of ordering custom textbooks for their courses. The professors can edit out those chapters of a book they are not interested in and add material of their own choosing.
The widespread use of the option mentioned above is LEAST likely to contribute to fulfilling which of the following educational objectives
A．Coverage of material relevant to a particular student body’s specific needs.
B．Offering advanced elective courses that pursue in-depth investigation of selected topics in a field.
C．Ensuring that students nationwide engaged in a specific course of study are uniformly exposed to a basic set of readings.
D．Making the textbooks used in university courses more satisfactory from the individual teacher’s point of view.
E．(E) Keeping students’ interest in a course by offering lively, well-written reading assignments.
，该烯烃可能有的结构是（ ）种