检查驻车制动时，拉动驻车制动拉杆，一般应听到（）声的咔嗒声。
A.6—9
B.2—4
C.3—5
D.2
参考答案：A
若a为方程x2+x-5=0的解，则a2+a+1的值为（ ）
A．16
B．12
C．9
D．6
— How long ______ your parents ______?
— They have just had their 35th anniversary (周年) party. [ ]
A. have, married
B. were, married
C. have, been married
