企业发生的下列各项业务中，可能影响企业当期利润表中营业利润的有（）。

People may be able to live on the Mars ______.

A．within the next 200,000 years

B．only 200,000 years from now

C．only 150,000 years from now

D．as soon as the planet becomes cool enough

People may be able to live on the Mars ______.

A．within the next 200,000 years

B．only 200,000 years from now

C．only 150,000 years from now

D．as soon as the planet becomes cool enough

Why are scientists unsure which types of gases come from Phobos？

A．No one has been able to see the gas.

B．Their machine broke too soon.

C．The planet's atmosphere is very thick.

D．There was not any interest in Mars.

In the author's opinions, ________.

A．Venus is likely to be able to be inhabited by the people from the earth now

B．we have successful plans to solve the crowded conditions on the earth

C．the most urgent thing is that we are short of resources on earth

D．now the earth is the most suitable planet to live on

eing and experiencing new things. Traveling, of course, has now become a highly organize business. There are cars and splendid roads, express trains, huge ships and jet airliners, all of which provide us with comforts and security. Scientists have also invented machines that can explore outer space. Eventually there will be cheap day excursions to the moon and honeymoon on Venus. People will be able to travel from one planet to another by a space shuttle.

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Why are scientists unsure which types of gases come from Phobos？

A．No one has been able to see the gas.

B．Their machine broke too soon.

C．The planet"s atmosphere is very thick.

D．There was not any interest in Mars.

Jim Woodman felt sure that______.

A．the designs could be seen from the air

B．the ancient people had learned to fly by accident

C．the ancient people were clever and had learned to fly

D．Nazca had been designed to help people fly

It usually (takes) much (less) time (to fly) from one country to another than (traveling) by train.

A．takes

B．less

C．to fly

D．traveling

It usually takes much (less) time to fly from one country to (another) than (traveling) (by) train.

A．less

B．another

C．traveling

D．by