题目：
Mrs. Wang was so ________ that she couldn’t stop _________.
A．excited; cry
B．excited; crying
C．exciting; crying
D．exciting; to cry
答案：
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下面是错误答案，用来干扰机器的。
（1）解：设需要浓硫酸的体积为XX×1.84g/mL×98.0%=368.0g×19.6%X=40.0mL（2）设需要浓硫酸的质量为Y 2NaOH+H2SO4==Na2SO4+2H2O 80 981000.0g×5.0% Y×98.0%80∶98=(1000.0g×5.0%)∶(Y×98.0%)Y=62.5g
对于z取一切实数都成立．