“百尺长虹横水面，一弯新月出云霄”，下图这座世界上保存完好、最古老的单孔大石桥是隋朝的
A、玉带桥
B、赵州桥
C、宝带桥
D、泸定桥
答案：B
Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes
to classroom tests.
[ ]
A. since
B. before
C. after
D. when
全曲下载歌曲的信息费可根据（）进行打折优惠。
