Questions 22 to 25 are based on the conversation you have just heard.

单项选择题A．Exposure to even tiny amounts of radiation is fatal.B．The effect of exposure to radiation is slow in coming.C．Radiation is avoidable in space exploration.D．Astronauts in spacesuits needn’t worry about radiation damage.

单项选择题A．A meeting with directors in the bank.B．Schedule for a business trip.C．The building, of a new plant.D．Reservation of flight tickets.