下列四组生物中，结构最相似的是（）
A.变形虫、水绵、蓝藻
B.烟草、草履虫、烟草花叶病毒
C.念珠藻、颤藻、蓝球藻
D.念珠藻、衣藻、蓝球藻
参考答案：C
The very real and far reaching implications inherent in the current changes being experienced by government spaceports, with terms of their effect upon the whole international space community, are also highlighted.
A．for terms of
B．as terms of
C．in terms of
D．from terms of
1851年在英国（）举办世界首次国际工业博览会，展览会的主要场馆时当代采用钢铁和玻璃材料建造的大型建筑（）。
