下列仪器中，具有溶解固体、配制溶液，较多量试剂的（ ）反应容器三种用途的是．
A．蒸发皿
B．烧瓶
C．试管
D．烧杯
答案：D
选词填空。
1. Five years ago, a little baby born. (is, was)
2. When he was born, a new star in the sky. (shine, shone)
3. Three wise men the star. (see, saw)
4. They he was a special baby. (knew, know)
5. Jesus's birthday Christmas day. (is, was)
6. We gifts to our friends and family at Christmas. (give, gave)
7. We stars on our Christmas trees, too. (put, putting)
如何降低气压机转速？
