若P（a，﹣2）与Q（3，b）关于x轴对称，则a=()，b=()_爱下问搜题

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问题填空题

若P（a，﹣2）与Q（3，b）关于x轴对称，则a=( )，b=( )

答案

3；2

选择题

More and more people find ______ necessary to protect our earth.

A．it

B．that

C．this

D．its

选择题

His happy life came to _____ end because he was put into _____ prison for stealing money.