—By using Alipay is so easy and safe.
A:what
B:who
C:which
D:whose
下列所给关系中正确的个数是( )
①π∈R; ②3 ∉Q; ③0∈N; ④|﹣4|∉N*; ⑤ 12 ∈Z.
下句中,只有一处错误,请找出并改正。
He should have his hair cuts.
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翻译下列句子。