把a=8，b=9代入式子3a+2b可得，
3a+2b
=8×3+2×9
=24+18
=42；
故选：B．
-What did your parents think about your decision?
-They always let me do ____ I think I should.[ ]
A. when
B. that
C. how
D. what
患者女性，43岁，肺部听诊可闻及大水泡音，该患者的诊断是
A．支气管炎
B．支气管肺炎
C．支气管扩张症
D．肺梗死
E．肺泡炎
