How many persons are in the conversation？A．One.B．Two.C．Three.D．Sour.

How many pieces of artwork are in the building？A．50B．150C．200D．250

How many hijackers are involved in the news item？A．18.B．2.C．8.D．1.

How many companies are presenting products in the Consumer Electronics Show？A．More than tw

How many nuclear reactors are reportedly damaged in the news？A．1.B．2.C．3.D．5.

Many things______almost impossible in the ancient times are very common today.A．being cons

In the passage how many cancers are mentioned in