Explain why none of the lanthanoid sesquioxides, Ln2O3, is as acidic as Al2O3

Explain why none of the lanthanoid sesquioxides, Ln₂O₃, is as acidic as Al₂O₃

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发布时间：2020-07-09

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第1题

Which of the following might explain why farm revenues are higher in years of lower production due to bad weather？（).

A、Demand is more elastic than supply.

C、Demand is relatively inelastic; a leftward shift in supply will increase total revenue.

E、None of the above.

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第2题

听力原文：Colds have always been a nuisance, and people have tried many strange ways to cur

听力原文： Colds have always been a nuisance, and people have tried many strange ways to cure them, However, none have worked. one Roman historian even recommended kissing the nose of a hairy mouse (29) ! But up till now we are only a little closer to finding a cure for it.

Scientists have discovered that a cold is not caused by a single virus, but by many. They have proved that people under stress are more likely to catch colds, although why this happens is still unknown (30) . Experiments also showed that women suffer more colds than men. But again, scientists are unable to explain why this is so.

Another experiment proved that getting cold does not cause colds. For this experiment, one group of human volunteers were showered with water and then made to stand in a windy corridor. Another group remained dry and inside a heated room. While you might expect people in the first group to catch colds more easily, they didn't.

one other thing that we now know is that colds are spread by water vapor from breath. This would explain why colds are more common in the winter than at other times: people spend more time indoors closer to other people, and also away from flesh air (31) .

(30)

A．Keeping warm and dry.

B．Drinking a lot of liquid.

C．Living close to the hospital.

D．Kissing the nose of an animal.

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第3题

A.To explain why recycling is important.B.To describe the recycling program.

A.To explain why recycling is important.

B.To describe the recycling program.

C.To discuss whether or not recycling should be mandatory.

D.To explain how to find the recycling facilities.

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第4题

Explain why nuclear magnetic resonance experiments show only one type of hydrogen atom in the ion.

Explain why nuclear magnetic resonance experiments show only one type of hydrogen atom in the $Explain why nuclear magnetic resonance experiments$ ion.