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单项选择题

2. 插花根据使用场合可以分成三种类别，分别是摆设花、服饰花、手捧花。图中的花属于？| According to the occasion, flower arrangement can be divided into three categories: decorative flowers, clothing flowers, hand tied bouquet. The flowers in the picture belong to?

A．摆设花|decorative flowers
B．服饰花|clothing flowers
C．手捧花|hand tied bouquet
D．以上都不是|none of the above

问答题

下图中哪个是黑腹果蝇第二染色体右臂端部及染色体中心？
A、a
B、b
C、c
D、d
E、e
F、f