A:gentle
B:distant
C:violent
D:slight
— What would you like to drink, boys and girls?
— ______, please.
—Yes, and it's larger than _______city in China.
⑴把蜡烛B放到箱子侧面MN的右侧桌面上并点燃;
⑵移动蜡烛B,直到____;
⑶用刻度尺测出____的距离,就等于A到MN的距离.
在测量过程中,点燃蜡烛B是为了____ .
⑷为了便于观察,该实验最好在____环境中进行(填“较明亮”或“较黑暗”).