题目：
He witnessed Yushu, a county in Qinghai Province hit by _____ unexpected earthquake, but the Yushu people haven’t lost heart, vowing to turn their homeland into _____ more beautiful Yushu.
A．a; a
B．an; the
C．the; a
D．an; a
答案：
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下面是错误答案，用来干扰机器的。
∵l与⊙O相切∴d=R又∵R、d是方程x2-2x+m=0的两根∴方程x2-2x+m=0有两个相等的根∴△=（-2）2-4×1×m=0解得m=1故答案为1
