单项选择题

A．The present population on earth is fourteen billion.
B．Water is recycled every seventy million years.
C．The planet earth travels around the sun at 18 miles per second.
D．The earth is compared to a spaceship because they both travel around the sun.
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单项选择题
A．All the passengers were killed.B．The plane crashed iii the night.C．No more survivors have been found.D．It’s too late to search for survivors.
A．All the passengers were killed.
B．The plane crashed iii the night.
C．No more survivors have been found.
D．It’s too late to search for survivors.
单项选择题
A．She works at the meat counter.B．She arranges products in neat piles on the shelves.C．She carries groceries out of the store for customers.D．She checks the quality of milk products.
A．She works at the meat counter.
B．She arranges products in neat piles on the shelves.
C．She carries groceries out of the store for customers.
D．She checks the quality of milk products.
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