单项选择题 An old woman is going shopping. She is going by boat. Her basket (篮子) is empty. Oh dear! Her basket is in the water. 'Help!' she says. 'Look! My basket is in the river. ' A boy sees the basket. He says. 'Don't worry! I can get it! I am a good swimmer (游泳者) He takes off his shirt and shoes and jumps (跳) into the fiver. A duck (鸭子) sees the basket. It gets into the haaket. The boy is swimming in the river. 'Where is the basket?' be asks. 'It's over them!' says the old womb. 'It's behind you! It's under the duck? The boy swims to the basket. 'Go away? he says to the duck. The duck jumps out of the basket and swims away. The boy takes the basket to the land. 'Oh. thank you!' says the woman. 'You are welcome? says the boy. 'Do you have my shirt and shoes. please?' 'Yes. Here you are. Oh. what's this in my basket? It's a duck's egg?An old woman is going to the shop ______A．by the roadB．by boatC．on foot

单项选择题 A．I'll look at them.B．What would you like today?C．It think I'll take it.

多项选择题 净化空调系统综合效能测定调整与洁净室的运行状态密切相关，包括（）等。