明天要交作业,SOS
问题描述：
明天要交作业,SOS
For each item in Column A,write the letter of the matching item in Column B.
Column A
18.nonsparking tools
19.fireworks
20.fertilizers
21.chlorophyll
22.chalk
23.X rays
24.treating bipolar disorders
25.baking soda
Column B
a.sodium
b.calcium
c.barium
d.beryllium
e.magnesium
f.strontium
g.potassium
h.lithium
Circle the element that would be the most reactive of the three.
26.Li Na K
27.K Fr Na
28.Ba Mg Be
29.Li K Ba
答
18-d
19-f
20-g
21-e
22-b
23-c
24-h
25-a
26.Li
27.K
28.Ba
29.Li