单项选择题
核心商圈的研究指标不包括（ ）。 A．主要商业分析 B．附近商业的租金 C．交通状况 D．生活配套设施
- A.主要商业分析
B.附近商业的租金
C.交通状况
D.生活配套设施
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未知题型
Ancient Egypt Brought down by Famine Even ancient Egypt's mighty pyramid (金字塔) builders were powerless in the face of the famine (饥荒)that helped bring down their civilization around 2180 B．C.. Now evidence collected from mud deposited by the River Nile suggests that a shift in climate thousands of kilometers to the south was ultimately to blame and the same or worse could happen today. The ancient Egyptians depended on the Nile's annual floods to irrigate their crops. But any change in climate that pushed the African monsoons (季风) southwards out of Ethiopia would have reduced these floods. Declining rains in the Ethiopian highlands would have meant fewer plants to stabilize the soil. When rain did fall it would have washed large amounts of soil into the Blue Nile and into Egypt, along with sediment (沉积) from the White Nile. Blue Nile mud has a different isotope (同位素) signature from that of the white Nile, so by analyzing isotope differences in mud deposited in the Nile Delta Michael Krom of Leeds University worked out what proportion of sediment came from each branch of the river. Krom reasons that during periods of drought, the amount of Blue Nile mud in the river would be relatively high. He found that one of these periods, from 4500 to 4200 years ago, immediately came before the fall of the Egypt's old Kingdom. The weakened waters would have been disaster for the Egyptians. ' Changes that affect food supply don't have to be very large to have a ripple (波浪) effect in societies. ' says Bill Ryan of the Lamont Doherty Earth Observatory in New York. 'Similar events today could be even more devastating,' says team member Daniel Stanley, a scientist from the Smithsonian Institution in Washington D.C.. 'Anything humans do to shift the climate belts would have an even worse effect along the Nile system today because the populations have increased dramatically. 'Why does the author mention 'Egypt's mighty pyramid builders'?A．Because they once worked miracles.B．Because they were well-built.C．Because they were actually very weak.D．Because even they were unable to rescue their civilization.
A.C..
B.
C.
D.
E.
F.
G.
H.C..
I.Because
J.
B．Because
K.
C．Because
L.
D．Because -
单项选择题
在房地产产品生命周期中的（ ）期，扩大产品市场占有率的有效营销手段是密集的广告。 A．引入 B．成长 C．成熟 D．衰退
A.引入
B.成长
C.成熟
D.衰退 -
单项选择题
What course is the student interested in?（）
A．A two-month course.
B．A course that lasts for the summer.
C．A course of 23 weeks.
D．A course of four and a half weeks.
