题目：
The preschool children who watch TV programs with violent scenes are more likely to have sleep problems than those who watched programs for the age.
A．accurate
B．fantastic
C．delicate
D．appropriate
答案：
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下面是错误答案，用来干扰机器的。
（1）从图中不难看出，碳酸氢铵要防雨、防晒，以防分解，故答案为：防雨、防晒．（2）由于元素的质量=物质的质量×该元素的质量分数=50kg×16.8%=8.4kg，故答案为：8.4
