[单项选择]Atoms (原子) are all around us. They are the bricks of which everything is made. Millions of atoms are held in just one grain of salt, but in spite of their small size they are very important. The way an everyday object acts depends on what kind of atoms are in it and how they act.
For example, you know that most solid objects melt (溶化) if they get hot enough. How does it happen It is the effect of the heat on the object’s atoms. All atoms move constantly. When they are hot, they move faster.
Usually the atoms in an object hold together and give the object its shape. But if the object grows hot, its atoms move so fast that they break the force that usually holds them together. They move out of their usual places so that the object loses its shape. Then we say that the object is melting.
Atoms in an object move ______.
A. when it is heated
B. whenever it is hot
C. when it is melted
D. all the time

[单项选择]Atoms (原子) are all around us. They are the bricks of which everything is made. Millions of atoms are held in just one grain of salt, but in spite of their small size they are very important. The way an everyday object acts depends on what kind of atoms are in it and how they act.
For example, you know that most solid objects melt (熔化) if they get hot enough. How does it happen It is the effect of the heat on the object’s atoms. All atoms move constantly. When they are hot, they move faster.
Usually the atoms in an object hold together and give the object its shape. But if the object grows hot, its atoms move so fast that they break the force that usually holds them together. They move out of their usual places so that the object loses its shape. Then we say that the object is melting.
Atoms are like bricks because ______ .
A. atoms are made up of bricks
B. atoms are made of everything
C. they are the same in size
D. everything is made of atoms

[单项选择](All things) (consist of) atoms or molecules, which (be) constantly (moving).（　）
A. All things
B. consist of
C. be
D. moving

[单项选择]With energy prices around the world hitting all-time highs, more and more consumers are welcoming the advent of the electric car. They believe that using the electric car will soon become a trend.
However, many other people doubt the practicality or efficiency of the electric car. They keep pointing out that it has to be recharged regularly. Besides, it is not as good looking as ordinary cars. And, above all, it still causes pollution.
Despite such criticism, fans of the electric car believe that all these problems can be solved. They insist that, with more investment and technology involved, all aspects of the electric car can be greatly improved.
Optimists predict that within 20 years there will be more electric than gas-powered cars on the roads. If so, we can look forward to consuming less of the world’s oil supply while still enjoying the freedom and convenience of driving.

To: George Smith
From: G
A. They will draw more criticism.
B. Investors get rich quickly.
C. The cars can be greatly improved.
D. The technology becomes more difficult.

[填空题]Sharks are found in all oceans all around the world because they are ______.

[单项选择]Overweight has become a problem people all around the world face, and it does not look like it will be solved in the near future regardless of the various efforts from all walks of life. And for those who have a heavier body than they are supposed to, one advice is given repeatedly: eat less and exercise more. This has long been the suggestion for getting rid of those extra pounds. But now it seems that all the hard work may have been in vain. Scientists say there are ten other reasons why people just keep getting bigger.
Scientists claim that sleeping habits, central heating, medicines and even some pollutants can play a role in weight gain. Lack of sleep could be partly to blame. In recent years, the average night’s sleep has dropped from nine hours to just seven. Sleep lack changes levels of the hormones that regulate food intake and body fat and increase hunger and appetite.
If it is too hot or too cold, we burn calories to cool down or heat up. But if the temperature
A. The living habits of one family.
B. The genes we inherit from our parents.
C. The marriage partner we choose.
D. The inhabitation of people with similar size living together.