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7、为什么要细化晶粒?生产中常用的细化晶粒的方法有哪几种?

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—Tom,whywereyou_____fromschoolyesterday?whywereyou_____fromschoolyesterday?—Igotabadcoldandmymothertookmetothedoctor's.

A. absent
B. present
C. left
D. lost

Nowthatallherthreechildrenhavegone______toworkorstudy,Mrs.WanglivesinHongkongalone.

A. aboard
B. abroad
C. board
D. broad

Hefoundhisuncle________inthereadingoftheSundaynews­paper.

A. interesting
B. focused
C. absorbed
D. involving

Maryinvitedmetoherbirthdaypartylastnight,butsinceIhadtolookaftermyyoungerbrother,Ididn’therinvi­tation.

A. accept
B. receive
C. answer
D. reply

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