你可能感兴趣的试题
They were formed in 1984. They are at the top of two active volcanoes. They are not like most other crater lakes. Water in them turns over regularly.
Water will flow down the hills Poisonous gases will be released suddenly． A strong wind will rise from the lakes The volcanoes will come to life．
the gases rise to the top and mix with air． people from the villages turn over the water． scientists have put in a computer system． they have more gases trapped at the bottom than other crater lakes
Optimistic. Worried. Indifferent. Unclear.
Good luck. It’s my pleasure I agree with you The same to you
erected a pressure-releasing pipe in the lake identified the gases at the bottom of the lake built a beautiful fountain near the lakes removed all dangerous gases from the lakes
They were formed in 1984. They are at the top of two active volcanoes. They are not like most other crater lakes. Water in them turns over regularly.
Scientists are planning to install pipes in all crater lakes． Scientists still do not know how to prevent gas explosions Explosion disasters could be avoided in the future Warning systems have been set up in the villages nearby．
the gases rise to the top and mix with air people from the villages turn over the water scientists have put in a computer system they have more gases trapped at the bottom than other crater lakes
erected a pressure-releasing pipe in the lake identified the gases at the bottom of the lake built a beautiful fountain near the lakes removed all dangerous gases from the lakes
They were formed in 1984． They are at the top of two active volcanoes． They are not like most other crater lakes． Water in them turns over regularly．
Water will flow down the hills. Poisonous gases will be released suddenly. A strong wind will rise from the lakes. The volcanoes will come to life.
Good luck It’s my pleasure I agree with you The same to you
are equally located between Canada and the U. S.. contain a small part of the world's fresh water. are governed neither by Canada nor by the U. S.. enjoy fresher water now than 25 years ago.
Water will flow down the hills. Poisonous gases will be released suddenly. A strong wind will rise from the lakes. The volcanoes will come to lif
the gases rise to the top and mix with air. people from the villages turn over the water. scientists have put in a computer system. they have more gases trapped at the bottom than other crater lakes.
team of scientists has erected a pressure-releasing pipe in the lake. identified the gases at the bottom of the lake. built a beautiful fountain near the lakes. removed all dangerous gases from the lakes.
湘公网安备 43130202000226号