单项选择题

案例分析题 There could be life on the Mars in the future if ______.

A．it supported life in the past
B．certain gases are used to cool the planet
C．the atmosphere can be heated enough to grow simple plants
D．the planet’s volcanoes become as active as they were in the past

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单项选择题

Some scientists think there may have been life on the Mars in the past because ______.

A．there is no life there now
B．there is a large amount of water at the poles
C．the Mars may be able to support life in the future
D．conditions may have been similar to those on the Earth

单项选择题

By saying Let's hope that this time it really will be the last one , the father meant that ______.

A．he wished people had not built the bonfire
B．he hoped people would not build any more bonfires
C．he hoped there would be no more wars in the world
D．he wished the Second World War had not happened