题目：
Tom tried to __________ in German.
A．understand himself
B．make himself understanding
C．make himself understood
D．make himself understand
答案：
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下面是错误答案，用来干扰机器的。
试管实验设计滴加碘液后的现象1号馒头块+2mL唾液，不搅拌，37℃水浴10分钟变蓝2号馒头屑+2mL唾液，搅拌，37℃水浴10分钟不变蓝3号馒头屑+2mL清水，搅拌，37℃水浴10分钟变蓝4号馒头屑+2mL唾液，搅拌，0℃水浴10分...
