【单选题】

Two travelers were riding on horseback through the south of Italy. Towards evening they (21) they has lost their way. They began to look for a house where they could rest for the night and perhaps they could find a guide to (22) them the right way in the morning.

After (23) for some time, they saw a farm house. When they (24) the house, they found a farmer and his wife having supper. They were asked to sit down and (25) too.As they were very hungry, they did so with (26)
While eating his supper the farmer kept his eyes on the plate without saying (27) . This made the travelers a little afraiD、After supper the farmer’s wife (28) them up to a store room, and showed them a (29) where they could sleep.Being (30) , they soon book off their clothes and went to beD、But the younger traveler was too (31) to go to sleep. He heard the farmer and his wife talking in the room in a (32) voice.At first he couldn’t hear any words, but then he (33) heard the husband say, "Must we kill them both " and the wife replied, "Yes, of course we must."A、moment later, he again heard the farmer (34) into the room, so he quickly (35) behind the door. The door slowly (36) , and the farmer came in with a light in one hand and a long knife in the other. He went to the (37) hanging on the wall, cut off a piece, and returned as (38) as he had come. The two travelers didn’t dare to go to (39) .Early in the morning they began to (40) in the dark through the kitchen, finding on the table a piece of meat cleaned and two chicks killeD、
A．low
B．loud
C．nervous
D．clear