人类历史上第一枚弹道导弹由（）发射。
A.德国
B.美国
C.前苏联
D.中国
参考答案：A
下列哪项不属于恶性肿瘤的生物学行为
A．逆转
B．自发消退
C．浸润性生长
D．自主性生长
E．膨胀性生长
Tom wants to know if we can ________ John for the night, since he has lost all his money and can go
nowhere. [ ]
A. put up
B. put off
C. put on
D. put down
