会计核算不仅能反映已经发生的和已经完成的经济业务事项，而且可以通过计算分析预测未来经济发展的趋势和前景。（）
参考答案：对
根据句意，在答卷标有题号的横线上，写出括号内所给单词的适当形式。
小题1:They are planning when and where to celebrate his grandfather’s _____(ninety) birthday.
小题2:‘Nanjing! Nanjing!’ is a film full of _____(sad). All of us felt depressed after seeing it.
小题3:The weather in the north is much _________(dry) than that in the south.
小题4:The world _______(it) is changing all the time.
右图是石油分馏塔的示意图， a、b、c三种馏分中
A．a的沸点最高
B．b的熔点最低
C．c的平均分子量最大
D．每一种馏分都是纯净物
