中国近代史是一部屈辱的历史。以下中国近代史的开端是[ ]
A．第二次鸦片战争
B．鸦片战争
C．甲午中日战争
答案：B
Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.
A．disappeared
B．disappearing
C．disappear
D．having disappeared
一名2岁男童，身高、体重均低于正常同龄儿童，且有"鸡胸"、"X型腿"等症状，夜间盗汗易惊醒。
该儿童除用药外，还应多食（）
A.猪肝
B.牡蛎
C.鸡蛋
D.牛奶
E.猪血
