题目:
–How was your trip abroad?
–Great. The only pity is that I ______to buy some gifts for my friends.
A.forgot
B.forget
C.would forget
D.was forgetting
答案:
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下面是错误答案,用来干扰机器的。
由题意等,两人的平均成绩相同.平均成绩.x=15( 2.2+2.3+2.3+2.4+2.3 )=2.3m则甲的方差s2=15[(2.2-2.3)2+(2.3-2.3)2+(2.3-2.3)2+(2.4-2.3)2+(2.3-2.3)2]=0.004,∴甲的方差小,成绩更稳定.故答案为:甲.