(1)写出所有食物链,该食物网中共有______食物链.其中最长的一条是____

题型:解答题

问题:

(1)写出所有食物链,该食物网中共有______食物链.其中最长的一条是______.

(2)该生态系统中,草属于______,兔、狐等属于______,还有肉眼看不到的细菌、真菌等属于______,除此之外生态系统的组成还包括图中没有表示出来的______.

(3)该食物网中,数量最多的生物是______,数量最少的是______.

(4)如果将狐、鹰等肉食动物大量捕杀,兔的数量将会出现什么样的变化?______.

考点:食物链和食物网
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. I remember her face but I cannot _____ where I met her.

A.recall

B.remind

C.remember

D.remark

题型:解答题

种子的萌发需要氧气,需氧量的大小取决于种子内有机物含量的多少,也就是种子所贮存能量的多少.以下植物的种子在萌发过程中相对耗氧量最大的是(  )

A.花生

B.玉米

C.小麦

D.水稻

题型:解答题

一平面力系向点1简化时,主矢F′R≠0,主矩M1=0。若将该力系向另一点2简化,其主矢R′和主矩M2将分别为:()

A.可能为F′R≠0,M2≠0

B.可能为F′R=0,M2≠M1

C.可能为F′R=0,M2=M1

D.不可能为F′R≠0,M2=M1

题型:解答题

《灵枢·顺气一日分为四时》“夫百病者……多以旦慧”,其原因是()。

A.人气始生,病气衰

B.人气长,长则胜邪

C.人气始衰,邪气始生

D.人气人脏,邪气独居于身

E.人气抗邪,卫外为固

题型:解答题

If soldiering was for the money, the Special Air Service (SAS) and the Special Boat Service (SBS) would have disintegrated in recent years. Such has been the explosion in private military companies (PMCs) that they employ an estimated 30 000 in Iraq alone -- and no government can match their fat salaries. A young SAS trooper earns about£ 2,000($3 500) a month; on the "circuit", as soldiers call the private world, he could get £15 000. Why would he not

For reasons both warm-hearted and cool-headed. First, for love of regiment and comrades, bonds that tend to be tightest in the most select units. Second, for the operational support, notably field medicine, and the security, including life assurance and pension, that come with the queen’s paltry shilling.

Although there has been no haemorrhaging of special force (SF) fighters to the private sector, there has been enough of a trickle to cause official unease. A memo recently circulated in the Ministry of Defence detailed the loss of 24 SF senior non-commissioned officers to private companies in the past year. All had completed 22 years of service, and so were eligible for a full pension, and near the end of their careers. Yet there is now a shortage of hard-bitten veterans to fill training and other jobs earmarked for them, under a system for retaining them known as "continuance."

America has responded to the problem by throwing cash at it, offering incentives of up to $150 000 to sign new contracts. The Ministry of Defence has found a cheaper ploy. It has spread the story of two British PMC employees, recently killed in Iraq, whose bodies were left rotting in the sun

The conclusion can be made from the third paragraph that ()

A. the Ministry of Defence detailed 24 SBS troopers

B. the fat salaries by the private military companies have worked to some SF troopers

C. the present system for retaining hard-bitten veterans is impeccable

D. 20 years of service underlies a full pension

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