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单选题

A．They best boost product sales when put online.
B．They are most effective when appearing on TV.
C．They are becoming more and more prevalent.
D．They impress kids more than they do adults.

参考答案D

解析:What does research find about advertisements featuring professional athletes?
D。讲座中提到，2010年，研究人员在报告中说，12至17岁的青少年看运动员所宣传的食品和饮料类商业广告比成年人多。因此，由职业运动员代言的广告给儿童留下的印象甚于给成年人留下的印象，故答案为D.。

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单选题

A．Always place kids' interest first.
B．Do what they advocate in public.
C．Message positive behaviors at all times.
D．Pay attention to their image before children.

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单选题Questionsare based on the following passage.
The tree people in the Lord of the Rings--the Ents--can get around by walking. But for real trees, it's harder to uproot. Because they're literally rooted into the ground, they are unable to leave and go（26） .
When a tree first starts growing in a certain area, it's likely that the（27）envelope—the temperature, humidity, rainfall patterns and so on--suits it. Otherwise, it would be unable to grow from a seedling. But as it（28）, these conditions may change and the area around it may no longer be suitable for its（29）.
When that happens, many trees like walnuts, oaks and pines, rely（30） on so-called "scatter hoarders," such as birds, to move their seeds to new localities. Many birds like to store food for the winter, which they（31） retrieve.when the birds forget to retrieve their food--and they do sometimes--a seedling has a chance to grow. The bird Clark's nutcracker, for example, hides up to 100,000 seeds per year, up to 30 kilometers away from the seed source, and has a very close symbiotic (共生的) relationship with several pine species, most（32）the whitebark pine.
As trees outgrow their ideal（33）in the face of climate change, these flying ecosystem engineers could be a big help in（34） trees. It's a solution for us--getting birds to do the work is cheap and effective--and it could give（35）oaks and pines the option to truly "make like a tree and leave. "
A. ages
B. breathing
C. climatic
D. elsewhere
E. exclusively
F. forever
G. fruitful
H. habitats
I. legacy
J. notably
K. offspring
L. replanting
M. subsequently
N. vulnerable
O. Withdraws
第（26）题选

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单选题第（27）题选

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