对青霉素G最易产生耐药性的细菌是
A．链球菌
B．大肠杆菌
C．淋球菌
D．金葡菌
E．破伤风杆菌
参考答案：D
若关于x的方程（k﹣1）x2+x﹣1=0是一元一次方程，则k=（ ）．
Unfortunately, it was in Yushu County, ______ a 7.1-magnitude earthquake happened on April 14, 2010, ______ a large number of students were buried inside damaged schools.
A．which; when
B．that; that
C．where; that
D．where; which
