【名词&注释】
本质特征(essential characteristic)、化学变化(chemical change)
[单选题]下列对化学变化的本质特征认识正确的是（ ）
A. 有能量变化
物质的颜色和状态发生改变
有新物质生成
发光放热
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举一反三：
[单选题]Mary always wanted to be a singer．(11) was the most important part in her life． Un-luckily， she had a (12) voice． Although she took lessons (13) many years， her voice didn't get better． It just got louder． Her teacher finally (14) teaching her， but she kept on practicing herself．One dayshedecided (15) a concert and invited her teacher to it． The teacher was very (16) about what to say after the concert． He knew it would be a (17)． one． At last he got an idea． When the concert (18) ， he went to see Mary． "Well，" said Mary， "What do you (19) my concert? "My dear， said the teacher． "You’ll never be (20) than you are tonight．
( )11．
A. Drawing
B. Music
C. Dancing
D. Reading
[单选题]59．
A. never
B. always
C. ever
D. hardly
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