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Gaokao Math Practice Question

3. (5 分) 设有下面四个命题 $p_{1}$ : 若复数 $z$ 满足 $\frac{1}{z} \in R$, 则 $z \in R$; $p_{2}$ : 若复数 $z$ 满足 $z^{2} \in R$, 则 $z \in R$; $p_{3}$ :若复数 $z_{1}, z_{2}$ 满足 $z_{1} z_{2} \in R$, 则 $z_{1}=\overline{z_{2}}$; $p_{4}$ : 若复数 $z \in R$, 则 $z \in R$. 其中的真命题为( $)$

  1. A.$\mathrm{p}_{1}, \mathrm{p}_{3}$
  2. B.$\mathrm{p}_{1}, \mathrm{p}_{4}$
  3. C.$p_{2}, p_{3}$
  4. D.$p_{2}, p_{4}$

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