单项选择题

What helps to confirm the existence of bacteria below the Earth’s surface

A．Modern experiments.
B．Advanced technology.
C．Precise statistics.
D．Keen observation.
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单项选择题
A．To tell him they are busy.B．To invite him to go to a film.C．To cancel an appointment.D．To ask him something about homework.
A．To tell him they are busy.
B．To invite him to go to a film.
C．To cancel an appointment.
D．To ask him something about homework.
单项选择题
What did ancient people think about milk
A．It was full of energy.
B．It gave out heat.
C．It could cure illness.
D．It could keep them healthy.
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