题目内容

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_ 查看材料

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.

查看答案

搜索结果不匹配？点我反馈

更多问题

A 白细胞计数增多，主要为中性中幼粒细胞、晚幼粒细胞和杆状粒细胞
B 原始细胞＜10%，嗜酸和嗜碱粒细胞增多，可有少量幼红细胞
C CFU-GM培养集落和集簇较正常明显增加
D 骨髓增生活跃，以红系为主

A 糖化血红蛋白＜6.5%
B 餐后2小时血糖＜8.0毫摩尔/升
C 空腹血糖＜6.1毫摩尔/升
D 餐后2小时血糖＜6.5毫摩尔/升

[说明]
该程序从正文文件test.txt中读入一批整数，并将它们按照递增的顺序存放在一个链表中。其中，函数struct LinkinsertChain(struct Linkhead,structLinkk)用来寻找结点k在链表head中的插入位置，并插入该结点。
[C程序]
include ＜stdio.h＞
include ＜stdlib.h＞
struct Link
{ int number;
struct Link next;
}
struct Link insertChain(struct Link head,struct Link k);
VOid main()
{ struct Link ptr, head;
FILE fd;
int hum;
if((fd=fopen("test.txt","r"))==NULL)
{print("Cannot open this file!\n");
return;
}
head=NULL；
while(fscanf(fd，"%d",hum)==1)
{ ptr=(1);
if(!ptr) return;
ptr-＞number=hum;
ptr-＞next=NULL;
head=insertChain(head，ptr);
}
(2);
return;
}
struct Link insertChain(struct Link head,struct Link k)
{ struct Link ptr,*u;
ptr=head;
while(ptr ＆＆ k ＆＆ k-＞number＞ptr-＞number)
{ u=ptr; (3) }
if(ptr == head) head=k;
else (4);
(5);
return head;
}

烹饪时由于食物原料的受热和各种因素的作用，各种维生素损失程度大小大致的顺序为：C＞B1＞B2＞其他B族＞A＞D＞E。（)