People are using more composites in making aircrafts mainly because
A．composites themselves are very light, strong and as flexible as metal.
B．composites can reduce the plane weight leading to less fuel consumption and carbon emissions.
C．composites can cause less carbon emissions in the process of flying.
D．composites are less expensive than metal.

判断题Word无法自动保存文档。()

未分类题Whats the authors attitude towards xenotransplantation?

判断题路由器主要用于局域网的连接。（）

未分类题What is the best title for the passage?A．The Bright Future for Man's HealthB．The Exploration on XenotransplantationC．The Most Likely Candidates for XenotransplantationD．Animals' Role in Saving Man's Life

未分类题Jean Michel Mariou indicates thatA．bullfighting is nothing more than a culture popular in many regions.B．regions sharing the corrida were separated because of the war.C．bloody conflicts might have been avoided if bullfighting had been allowed officially.D．regions sharing the same culture are likely to be united as a result of the war.