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【单选题】
青为菊科植物黄花的干燥地上部分。青主要抗疟有效成分，系我国学者于20世纪70年代初首次从青中分离得到。临床应用表明青间日疟或恶性疟的治疗具有疗效显著、副作用小的优点，是一种高效、速效的抗疟有效单体化合物。青素的结构类型是（）A.
单萜
B.
倍半萜
C.
二萜
D.
三萜
E.
四萜
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反馈参考答案：
举一反三
【单选题】Who are the speakers talking about?
A.
A colleague.
B.
An office manager.
C.
A typist
【单选题】Who are the speakers?
A.
Salesman and customer.
B.
Manager and secretary.
C.
Nurse and patient.
【单选题】Who are the speakers?
A.
a. English majors.
B.
b. Senior students at college.
C.
c. Beginners in English study.
D.
d. Non-English majors at college.
【单选题】Who are the speakers?
A.
English majors
B.
senior students at college
C.
beginners in English study
D.
non-English majors at college
【单选题】Who are the speakers?
A.
A Student and a teacher.
B.
An interviewer and clerk.
C.
A student and a president.
D.
An employer and an employee.
相关题目：
【单选题】Who are the speakers?
A.
Salesman and customer.
B.
Manager and secretary.
C.
Nurse and patient.
参考解析：
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