地球上原是生命形成的时间大约是（ ） A.36亿年前 B.46亿年前 C.400多万年前 D.50亿年前
- How long has the bookshop been in business? -____1982. A. After B.In
常温下pH＝3的二元弱酸H2R溶液与a L pH＝11的NaOH溶液混合后，混合液的pH刚好等于7（假设反应前后体积不变），则对反应后混合液的叙述正确的是A. c(R2－)
There are ____ of students in the school, but only ____of them are girls. A. hundreds, two hundred B. hundred ,two hundreds C. hundreds, two hundreds
下列属于新中国教育方针和政策的重要内容的是 ( ) A. 成立“红卫兵”组织 B. 知识青年“上山下乡” C. 培养有社会主义觉悟的有文化的劳动者 D.
1. She____much younger than she really is. A.turns B.becomes C.grows D.appears
世界上面积最大的平原是（ ） A．东欧平原 B．华北平原 C．亚马孙平原 D．西西伯利亚平原
Fred is always ________ because he often does something good for his health outdoors. A. weak B. nervous C. serious D. energetic
