单项选择题

A．The astronauts shouldn"t make commercial products.
B．It is difficult to make tiny plastic flowers in space.
C．The astronauts have nothing to do in space.
D．The astronauts could do more useful things.
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单项选择题
A．A group of men moving to California in 1849.B．A immigration peak in the American history.C．Women from other countries in 1940s.D．The rich treasure and natural resources in 1849.
A．A group of men moving to California in 1849.
B．A immigration peak in the American history.
C．Women from other countries in 1940s.
D．The rich treasure and natural resources in 1849.
单项选择题
A．Saying goodbye to her secretary.B．Buying a ticket for a concert.C．Ordering a dinner in a hotel.D．Booking a flight ticket.
A．Saying goodbye to her secretary.
B．Buying a ticket for a concert.
C．Ordering a dinner in a hotel.
D．Booking a flight ticket.
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