听力原文:M: I haven't seen Calvin lately.
W: I wish I could say the same. He frequently drops by just at Supper time. I couldn't be so angry if he called to warn us. But he always claims that he fogot our number.
Q: Why is the woman so angry at Calvin?
(15)
A.Because he forgot her phone number.
B.Because she hasn't seem him lately.
C.Because he never invites her to dinner.
D.Because he doesn't phone ahead before visiting.
第1题
编码产物位于细胞核内对基因的转录有直接调节作用的癌基因家族是
A.ras癌基因家族
B.myc癌基因家族
C.sxc癌基因家族
D.erb癌基因家族
E.sis癌基因家族
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