首都博物馆展陈由___________、___________和___________三大部分组成。
参考答案:基本陈列、精品陈列和临时展览
a与b的和的4倍,用字母表示可以写成4a+b.______.
Questions 24-30
Thomas Edison provided valuable wealth for the modern world because ______.
A.he never let any time slip by
B.he always thought and planned
C.he always tapped out messages without stopping