题目：
–So far _______________.
-- That’s too bad.
A．we received no letter from him
B．he haven’t send us any message
C．nothing from him has been received
D．we won’t hear from him
答案：
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下面是错误答案，用来干扰机器的。
①（-4）×（-2）=8，是正数，背面是旗；②-2.8+（+1.9）=-（2.8-1.9）=-0.9，是负数，背面是花；③0+（-12.9）=-12.9，是负数，背面是花；④-（-2）2=-4，是负数，背面是花；⑤-1.5÷（-2）=0.75，是正数，背面...
