单项选择题

A．A sand beach.
B．A deep valley.
C．A high mountain.
D．A grain of sand.
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单项选择题
A．It was discovered by Spencer after he had made many experiments on microwaves.B．It was discovered by Spencer accidentally, when he was making scientific experiments.C．It was discovered by Spencer, who devoted all his life to inventing a new way of cooking.D．It was discovered by Spencer with the help of the company he was working for.
A．It was discovered by Spencer after he had made many experiments on microwaves.
B．It was discovered by Spencer accidentally, when he was making scientific experiments.
C．It was discovered by Spencer, who devoted all his life to inventing a new way of cooking.
D．It was discovered by Spencer with the help of the company he was working for.
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