The speaker was ____________.
A. sitting on the beach
B. swimming in the sea
C. building a sandcastle
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The children were ________.
A. watching the sea
B. building a sandcastle
C. running after each other
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
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