The children were ________.
A. watching the sea
B. building a sandcastle
C. running after each other
查看答案
The main idea of the passage is to ____________.
A. teach children how to build sandcastles
B. tell children the way of protecting their sandcastles
C. tell people how to face frustration (挫折)
世界上第一台电子计算机是（ ）年研制成功的。
A. 1936
B. 1946
C. 1956
D. 1949
第一台电子计算机的名字是（ ）
A. UNIVAX
B. Z70
C. PDP7
D. ENIAC
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