据估计，到2015年风能行业产能将比目前水平（）以上。
A.翻两番
B.增长50%
C.增加两倍
D.增加三倍
参考答案：A
燃烧器内二次风用途？
Which of the following is NOT a type of phytoplankton
A．Green algae.
B．Diatoms.
C．Blue-green algae.
D．Amoeba.
