问题
单项选择题 A1/A2型题
某维生素类药物在三氯醋酸或盐酸存在下，经水解、脱羧、失水变为糠醛，加吡咯，加热至50℃即产生蓝色，该药物应为（）
A.维生素A
B.维生素C
C.维生素B1
D.维生素E
E.维生素D
答案
参考答案：B
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某维生素类药物在三氯醋酸或盐酸存在下，经水解、脱羧、失水变为糠醛，加吡咯，加热至50℃即产生蓝色，该药物应为（）
A.维生素A
B.维生素C
C.维生素B1
D.维生素E
E.维生素D
参考答案：B
Timetables are important. They help you know what your classes are and when your classes are. They help you get to your classes on time. A class timetable has the names and time of all classes. A good timetable has other information(信息) too. You can write your teachers’names on it. In some schools, students have the same class in the same place every day—from Monday to Friday. The following timetable is fit(合适的) for those students.
a. the names of the subjects b. the time of all classes c. the classroom d. the teachers’ names e. the workdays of a week
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