测定罐头食品中的亚硝酸盐含量时，将试样加入饱和硼砂溶液后，用()左右的水约300mL将试样洗入500mL的容量瓶中，于沸水浴中加热15min，取出冷却备用。
A. 100℃
B. 85℃
C. 70℃
D. 50℃
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社会学是关于社会良性运行和协调发展的条件和机制的综合性社会科学。()
The show () by the time we arrive at the theatre.
A. has started
B. will start
C. starts
D. will have started
Which of the following sentences is NOT an indicative mood(陈述语气)？
A. She never tells a lie.
B. Come and help me, son.
C. It"s quite a good idea.
D. The weather gets hotter.
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