[单项选择]

Sugar is so much a part of our modem life that we only really think about it when, for some reason, we cannot obtain it. It has been known to man for at least 3,000 years, but it has come into common use only in modern times. Until quite recently it was considered as a medicine and as a luxury for the very rich only.
Sugar is, then, very important to our civilization. But what exactly is it Of course, most of us recognize sugar immediately as the sweet material which we put in coffee or cakes. This common form of sugar is derived from two plants: the sugarcane ( a type of grass which grows to a height of twenty feet) and the sugar beet ( which grows underground). But there are in fact many types of sugar, and the chemist recognizes hundreds of different varieties, each coming from a different source.
About 90% of the sugar is produced as food. Only 10% is used in industry for purposes other than food production. Yet sugar has great possibilities for use as the bas
A. What Sugar Is
B. Sugar Through the Ages
C. The Advantages of Sugar
D. Present and Future Uses of Sugar

[单项选择]

Sugar is so much a part of our modem life that we only really think about it when, for some reason, we cannot obtain it. It has been known to man for at least 3,000 years, but it has come into common use only in modern times. Until quite recently it was considered as a medicine and as a luxury for the very rich only.
Sugar is, then, very important to our civilization. But what exactly is it Of course, most of us recognize sugar immediately as the sweet material which we put in coffee or cakes. This common form of sugar is derived from two plants: the sugarcane ( a type of grass which grows to a height of twenty feet) and the sugar beet ( which grows underground). But there are in fact many types of sugar, and the chemist recognizes hundreds of different varieties, each coming from a different source.
About 90% of the sugar is produced as food. Only 10% is used in industry for purposes other than food production. Yet sugar has great possibilities for use as the bas
A. about 90% of sugar is used as food
B. only 10% is used in industry
C. sugar is used for making plastic
D. future uses of sugar

[单项选择] Sugar is so much a part of our modern life that we only really think about it when, for some reason, we cannot obtain it. It has been known to man for at least 3,000 years, but has come into common use only in modern times. Until quite recently it was considered as a medicine and as a luxury for the very rich only. Sugar is, then, very important to our civilization. But what exactly is it Of course, most of us recognize sugar immediately as the sweet material which we put in coffee or cakes. This common form of sugar is derived from two plants: the sugar cane (a type of grass which grows to a height of twenty feet) and the sugar beet (which grows underground). But there are in fact many types of sugar, and the chemist recognizes hundreds of different varieties, each coming from a different source. About 90% of the sugar produced as food. Only 10% is used in industry for purposes other than food production. Yet sugar has great possibilities for use as the basis of chemica
A. What sugar is
B. Sugar Through the Ages
C. The Advantages of Sugar
D. Present and Future Uses of Sugar

[填空题]There is much in our life which we do not control and we are not even responsible for.

• A.is
• B.which
• C.and we are
• D.for

[单项选择]Works of architecture are so much a part of our environment that we accept them as fixed and scarcely notice them until our attention is summoned. People have long known how to enclose space for the many purposes of life. The spatial aspect of the arts is most obvious in architecture. The architect makes groupings of enclosed spaces and enclosing masses, always keeping in mind the function of the structure, its construction and materials, and, of course, its design—the correlative of the other two. We experience architecture both visually and by moving through and around it, so that we perceive architectural space and mass together. The articulation of space and mass in building is expressed graphically in several ways; the principal ones include plans, sections, and elevations.
A plan is essentially a map of floor, showing the placement of the masses of a structure and, therefore, the spaces they bound and enclose. A section, like a vertical plan, shows placement of the masses as
A. space
B. graphic
C. environment
D. masses

[填空题]So we asked our friends to help us. So we asked our friends ______ ______.

[填空题]