[单选题] ________the issue doesn't seem to be difficult at all.

1、[阅读理解]Which of the following can turn customers ’attention into real interest?
A. Listing the product' s main features.
B. Describing the benefits of a product.
C. Selling a product at a great discount.
D. Offering free samples through a link.

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2、[阅读理解]13.
A. happy
B. easy
C. safe .
D. active

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3、[阅读理解]Why is CO2 compared to a fertilizer in Para. 3?
A. They both absorb light.
B. They both store heat.
C. They both help plants grow.
D. They both cause global warming.

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4、[阅读理解]What is implied in the last paragraph?
A. The Amazon rainforest may disappear soon.
B. The Amazon may take up more CO2 in the future.
C. The size of the Amazon basin may become smaller.
D. People may change the name of the Amazon River.

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5、[阅读理解]How does exercise sharpen the mind according to Para. 2?
A. By increasing the brain size.
B. By decreasing the protein level.
C. By extending the time of concentration.
D. By strengthening brain cells' connections.

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