单项选择题

It can be inferred from the para. 1 that ______.

A．the Clarendon county are connected to other church fires
B．the burning of churches may be caused by terrorists
C．no one was arrested
D．FBI agents are not involved in the case

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热门试题

单项选择题

It carries white blood cells and disease-fighting chemicals called antibodies to places where foreign invaders such as bacteria and viruses are causing infections this statement______.

A．proves how blood fights against invaders
B．implies how invaders cause infections
C．dose not tell how white cells fight against foreign invaders
D．explain the functions of the red cells and white cells

单项选择题

In this article the author states that blood test has______.

A．only one function
B．two functions
C．three functions
D．four functions