下列果实不是红色的树种是（）。
A.山楂
B.毛樱桃
C.南蛇藤
D.紫叶小蘗
参考答案：C
I often doubt ______. [ ]
A. that this song is worth listening to
B. if this song is worth listening
C. that this song is worth listening
D. if this song is worth listening to
就作者“Mark Twin”而言，按照文后参考文献标准著录格式，应将其写成（）。
A.Mark Twin
B.Twin M
C.Twin，Mark
D.Mark，T
