（）年，第一颗原子弱试验成功，中国从此有了自己的核威慑力量。
参考答案：1964
Stay in touch with people _____ you really care about and _____ really care about you.
A．who..who
B．whom..whom
C．who...whom
D．which...that
十二指肠溃疡的临床特点是
A．可并发大出血和穿孔
B．恶变率比胃溃疡高
C．餐后延迟痛
D．抗酸剂无效
E．周期性发作
