问题
不定项选择题
下列叙述不合理的是 [ ]
A．化学反应更多的是给人类带来灾难
B．化学反应常常伴随热量的变化
C．化学反应前后元素的种类不改变
D．化学反应前后催化剂的性质不改变
答案
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搜题请搜索小程序“爱下问搜题”
下列叙述不合理的是 [ ]
A．化学反应更多的是给人类带来灾难
B．化学反应常常伴随热量的变化
C．化学反应前后元素的种类不改变
D．化学反应前后催化剂的性质不改变
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Jane Brown is a cute girl. She is from China. But now she and her parents live in the USA, because her father works there. Jane is twelve. She studies at a primary school. She likes Art lessons best. Her mother always buys her some crayons as presents. Jane has a twin sister. They like spring best. On those warm and windy days, they often fly kites in the park nearby.
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