题目内容

【题目】若黄赤交角由现在的23°26′增大到30°,下列叙述错误的是

A. 四季变化明显的地区范围减小 B. 广州昼夜长短变化幅度减小

C. 太阳直射点的移动范围变大 D. 北极圈的纬度为60°N

【答案】B

【解析】黄赤交角决定回归线纬度,且回归线纬度与极圈纬度互余。若黄赤交角变大,回归线纬度变大,极圈纬度变小,则温带的范围变小,热带范围和寒带范围变大。A答案,四季变化明显的地区为温带地区,范围减小,正确。B答案,回归线纬度变大,各地昼夜长短变化幅度增大(赤道地区和纬度大于等于66.5°地区除外),故广州昼夜长短变化增大,B答案错误。C答案,太阳直射点的移动范围为南北回归线之间,若黄赤交角变大,回归线纬度变大,则移动范围变大,C正确。D答案,黄赤交角决定回归线纬度,且回归线纬度与极圈纬度互余,若黄赤交角由现在的23°26′增大到30°,则北极圈的纬度为60°N,D正确。题干让选择错误的。故选B。

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【题目】根据短文内容的理解,选择正确答案。 Sometimes called Amazonia, the rainforest of the Amazon River basin is the largest in the world. It stretches (延伸) across more than half of Brazil and parts of seven other South American countries (and French Guiana). With a land area of 2.7 million square miles, the Amazon rainforest is almost two thirds the size of the US.
Rainforests are important to the health of the entire planet. Often called "the lungs of the planet", the Amazon rainforest, with its rich plant life, stores carbon dioxide while giving out the oxygen we need to survive.
At one time, rainforests covered 14 percent of Earth's surface. Deforestation has reduced that figure to 6 percent today. Much of the loss has been in the Amazon.
Fortunately, over the years, Brazil has also become a world leader in rainforest preservation. A law called the Forest Code, originally passed in 1965, requires the Amazon's farmers to protect 80 percent of their land from farming. And democratic governments beginning in the early 1990s began to enforce it seriously.
Efforts to save the Amazon increased under President Luiz Inacio Lula da Silva (2002—2011). Brazil set aside about 150 million acres of the rainforest, an area about the size of France, for protection. Deforestation fell by 74 percent between 2004 and 2009.
Other countries of the Amazon have also done their parts. This year, Peru created a forest reserve about the size of California's Yosemite National Park.
(1)What is the size of the Amazon rainforest?
A.About the size of France.
B.Nearly half the size of Brazil.
C.Over half the size of the US.
D.About the size of seven South American countries.
(2)How much of the rainforest has been lost due to deforestation according to Paragraph 3?
A.6%.
B.Approximately 8%.
C.14%.
D.More than 50%.
(3)Which country contributes most to the preservation of the Amazon rainforest?
A.Peru.
B.Brazil.
C.The US.
D.French Guiana.
(4)What does the author feel about the situation of the Amazon?
A.Optimistic.
B.Moved.
C.Worried.
D.Uncertain.

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