读一读，判断正(√)误(×)。

Dear friend,

   This is a photo of my family. I have one brother and one sister. My sister Rachel

is older than me. She is heavier, too. My brother Jim is 8 years younger

than me. He is only 4 years old and he is shorter than me.

My mom is one year older than my dad and she is heavier, too.

                                                                                                         Love, Jenny

( )l. Jenny has two brothers.                  

( )2. Rachel is heavier than Jenny.             

( )3. Jim is shorter than Jenny.                  

( )4. Jenny is 12 years old.                    

( )5. Jenny's mom is younger than her dad.      

水泥熟料的四种矿物成分中，早期强度最高的是（）。

A.C₃S

B.C₂S

C.C₃A

D.C₄AF