[单项选择]The US border with Canada is the ______ in the world.
A. longest defended border
B. longest undefended border
C. longest undefined border
D. longest coastal border

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[单项选择]The US border with Canada is the ______ in tile world.
A. longest defended border
B. longest undefended border
C. longest undefined border
D. longest coastal border

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[单项选择]The Great Lakes between the US and Canada are the largest bodies of fresh water in the world. For a long time, people lived happily beside the Lakes until the countries began to build factories along the shores. Pollution was killing the Lakes; pretty soon, the Lakes’ ecosystem was not right any more. Scientists knew something had to be done. So did the government. They learnt it was important to keep the ecosystem of the Lakes healthy and strong. If the Lakes dried up, the whole world would feel it. Many areas would become deserts and many animals would lose their homes and maybe die out. As a result, they set up a lab called the Great Lakes Environmental Research Laboratory to solve the problem.

The largest bodies of fresh water are between the US and Canada.
A. Right.
B. Wrong.
C. Doesn’t say.

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Education in Canada

Education in Canada is provided, funded and overseen by federal, provincial, and local governments. It is generally divided into elementary (Primary School, Public School), followed by Secondary (High School) and Post Secondary (University, College). Within the provinces under the ministry of education, there are district school boards administering the educational programs. Education is compulsory up to the age of 16 in every province in Canada, except for Ontario and New Brunswick, where the compulsory age is 18. In some provinces early leaving exemptions can be granted under certain circumstances at 14. Canada generally has 190 school days in the year, officially starting from September (after Labor Day ) to the end of June ( usually the last Friday of the month, Wednesday in some Ontario schools).
Pre-university
Primary education and secondary education combined are sometimes refer
A. profitable
B. esteemed
C. competitive
D. liberal

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Passage One

As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile changeable thing depending to a large extent on the relationship of the color to other colores seen simultaneously. It is not fixed in its relation to the direct stimulus which creates it. On the other hand, the properties of surfaces that give rise to color do not seem to change greatly under a wide variety of illumination colors, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to the due in large part to the mechanism of color adaptation mentioned earlier.
When the eye is fixed on a colored area, there is an immediate readjustment of the sensitivity of the eye to color in and around the area viewed. This
A. a time lag in the focusing ability of the eye
B. the immediate loss of the "afterimage" of the first object
C. some inability’ to see colors of the latter-named objects until loss of sensitivity has been regained
D. adaptation in the central area of the eye but little adaptation in the lateral areas to the new intensity level

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[单项选择]The US border with Canada is the ______ in the world.A. longest defended borderB. longest undefended borderC. longest undefined borderD. longest coastal border

更多"The US border with Canada is the __"的相关试题:

[单项选择]The US border with Canada is the ______ in the world.
A. longest defended border
B. longest undefended border
C. longest undefined border
D. longest coastal border