使用环磷酰胺对小鼠染毒，经处死动物、收集骨髓细胞、低渗、固定、Giemsa染色等步骤

Good morning, everyone! Welcome to Cool Food Store. Christmas Day is next Sunday. Our 1. ______ is on sale for Christmas. 2. ______ and have a look. We have hamburgers 3. ______ only 7 dollars. Do you like snacks（零食）? We 4. ______ all kinds（种类）of snacks. You can also buy vegetables at our store—potatoes, 5. ______... They are all 6. ______. Our drinks（饮料）are all at good 7. ______. Juice is 2 dollars. Coke is 3 dollars. How much is our milk? Oh, it’s only 1 dollar. Do you need fruit? Come to our store. We have many fruits, like（例如）oranges, pears and strawberries. Our store is open（营业的）8. ______ 9:00 am to 9:00 pm every day. 9. ______ want it, we have it. Come to our store to buy some of your favorite food. Then you can have a 10. ______ dinner with your family on Christmas Day.

小题1:	A．clothes B．food C．watch D．book

小题2:	A．To go B．To come C．Come D．Take

小题3:	A．for B．with C．at D．to

小题4:	A．buy B．help C．has D．sell

小题5:	A．apples B．carrots C．salad D．rice

小题6:	A．difficult B．busy C．nice D．happy

小题7:	A．days B．pictures C．colors D．prices

小题8:	A．about B．from C．in D．for

小题9:	A．We B．They C．You D．He

小题10:

A．boring B．big C．late D．free