The author suggests that when sea horse babies are ready to be born __________.

A．the male sea horse seems very happy

B．it is difficult for them to come out

C．the female sea horse joins the male

D．they need larger space in the pouch

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答案解析

细节题。第四段指出：当幼仔要出生的时候，雄性海马要用尾巴紧紧抓住海草茎，并且摇动、弯曲和尽力伸展身体，有时候还要借助岩石或坚硬的海藻来挤压以迫使幼仔出来，可见幼仔出生很不容易。其他三项文章都未提到。故答案为B。

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1 Which fact does the author want the reader to remember most?

A．The male sea horse gives birth to the young.

B．The female sea horse lays up to 200 eggs at a time.

C．Baby sea horses are born in groups of five or more.

D．The female will return every day to check on the eggs.

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2 请根据短文的内容，回答题。

Don't Rely on Plankton to Save the Planet

Encouraging plankton growth in the ocean has been touted by some as a promising way to remove carbon dioxide from the atmosphere. __________ (46)
Adding iron to patches of ocean can make plankton bloom temporarily. The microscopic organisms suck up dissolved carbon dioxide from the water, which in turn is replaced by carbon dioxide from the air. __________ (47)
Jorge Sarmiento from Princeton and his colleagues developed a complex computer model to analyze how factors such as ocean chemistry and water circulation would affect the process if 160,000square kilometers of ocean were seeded with iron for a month. __________ (48)
In their scenario, which covers an area 10 times as big as the largest experiment of this kind ever proposed, fertilizing the ocean removes 1 million tons of carbon from the atmosphere -- just 0.2 per cent of the carbon dioxide humankind spews out each month.
Rough estimates in the past have predicted similarly disappointing results. __________ (49) says Sallie Chisholm, an environmental engineer from the Massachusetts Institute of Technology.
"But the take-home message is the same. __________ (50)"
第46题___________

A．Its opponents argue, however, that it will stop global warming.

B．Its opponents fear that it will damage the marine ecosystem, and now a computer model shows that the trick would also be remarkably inefficient.

C．As plankton die and settle on the ocean floor, their carbon is supposedly locked up in the seabed.

D．They found that 100 years later only between 2 and 11 per cent, of the extra carbon that was originally taken up by plankton had actually been removed from the atmosphere.

E．"These are newer and better models."

F．Ocean fertilisation is not the answer to global warming.

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3 第47题___________

A．Its opponents argue, however, that it will stop global warming.

B．Its opponents fear that it will damage the marine ecosystem, and now a computer model shows that the trick would also be remarkably inefficient.

C．As plankton die and settle on the ocean floor, their carbon is supposedly locked up in the seabed.

D．They found that 100 years later only between 2 and 11 per cent, of the extra carbon that was originally taken up by plankton had actually been removed from the atmosphere.

E．"These are newer and better models."

F．Ocean fertilisation is not the answer to global warming.

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