单项选择题

A．It was by continuous exploitation of the environment.……

A．It was by continuous exploitation of the environment.
B．It was largely by chance.
C．It was because of houseflies.
D．It was by chance initially and by cleverness now.

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热门试题

单项选择题A．They suffer from mental pains. B．They start doing something in an active way. C．They become uninterested in class activities. D．They may grow up to be passive watchers.

A．They suffer from mental pains.
B．They start doing something in an active way.
C．They become uninterested in class activities.
D．They may grow up to be passive watchers.

单项选择题A．They have three children already. B．Cathy wishes to have a baby, but Tom doesn’t. C．They will start a family as soon as they get married. D．They don’t want children for the time being.

A．They have three children already.
B．Cathy wishes to have a baby, but Tom doesn’t.
C．They will start a family as soon as they get married.
D．They don’t want children for the time being.

单项选择题A．To look at the audience directly. B．To look at something else in the room. C．To be better prepared before presentation. D．To ask psychologists for help.

A．To look at the audience directly.
B．To look at something else in the room.
C．To be better prepared before presentation.
D．To ask psychologists for help.

填空题affairs

单项选择题A．We need it to decorate our bodies. B．It is our second need. C．We need it to cover our bodies. D．Weather is changing all the time.

A．We need it to decorate our bodies.
B．It is our second need.
C．We need it to cover our bodies.
D．Weather is changing all the time.

单项选择题A．She couldn’t wait her bus home. B．She spent her time shopping. C．She got interested in what she is reading. D．She didn’t wake up in time.

A．She couldn’t wait her bus home.
B．She spent her time shopping.
C．She got interested in what she is reading.
D．She didn’t wake up in time.

单项选择题A．Why species don’t avoid extinction by adapting. B．Why species become extinct at the rate they do. C．Why humans aren’t extinct. D．How many species aren’t extinct.

A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.

填空题36（）

单项选择题A．He enjoyed using it. B．He left it in the taxi. C．He left it at the airport. D．He lost it on his trip.

A．He enjoyed using it.
B．He left it in the taxi.
C．He left it at the airport.
D．He lost it on his trip.

单项选择题A．There was much more disorder. B．This time the electricity supply failed. C．It was quite unexpected. D．It came in the cool autumn.

A．There was much more disorder.
B．This time the electricity supply failed.
C．It was quite unexpected.
D．It came in the cool autumn.