输油软管在使用时，最小弯曲半径应不小于（）。
A.3m
B.2m
C.1m
参考答案：A
Bill won’t make any progress __ he studies harder than before.
A．if
B．when
C．because
D．unless
Finally the hunter shot at the wide animal.But it ___ ot its feet before falling down.
A．rose itself
B．stood up
C．struggled
D．got up
