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