4PGC—380/350×1000型破碎机夏季使用的是（)号齿轮油。

A.150万元

B.200万元

C.300万元

D.350万元

A.赚取的利润总额为350万元

B.赚取的剩余价值总额为400万元

C.赚取的剩余价值率为100%

D.利润率为17.5%

表2-5按照不同阶层年收入数据(所有家庭，1995年)，显示了各阶层所包含的家庭数与年均收入。表2-6按照储蓄余额的大小(所有家庭，1995年)，显示了各阶层包含的家庭数与平均储蓄余额。

(1)分别画出年收入与储蓄余额的洛伦茨曲线。

(2)求各自的基尼系数。

Part A

Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points)

Sharks have gained an unfair reputation for being fierce predators of large sea animals. Humanity's unfounded fear and hatred of these ancient creatures is leading to a worldwide slaughter that may result in the extinction of many larger, coastal shark species. The shark is the victim of a warped attitude of wildlife protection: we strive only to protect the beautiful, nonthreatening parts of our environment. And, in our efforts to restore only nonthreatening parts of our earth, we ignore other important parts.

A perfect illustration of this attitude is the contrasting attitude towards another large sea animal, the dolphin. During the 1980s, environmentalists in the U.S.A. protested the use of driftnets for tuna fishing in the Pacific Ocean since these nets also caught dolphins. The environmentalists generated enough political and economic pressure to prevent tuna companies from buying tuna that had been caught in driftnets. In contrast to this effort, the populations of sharks in the Pacific Ocean have decreased to the point of extinction and there has been very little effort by the same environmentalists to save this important species, of marine wildlife. Sharks are among the oldest creatures on earth, having survived in the seas for more than 350 million years. They are extremely efficient animals, feeding on wounded or dying animals, thus performing an important role in nature of weeding out the weaker animals in a species. Just the fact that species such as the Great White Shark have managed to live in the oceans for so many millions of years is enough proof of their efficiency and adaptability to changing environments. It is time for humans, who may not survive another 1000 years at the rate they are damaging the planet, to east away their fears and begin considering the protection of sharks as creatures that may provide us insight into our own survival.

The main focus of this passage is ______.

A．why sharks have such a bad reputation

B．how sharks become some of the oldest creatures on earth

C．how sharks illustrate a problem in wildlife protection

D．why the campaign to save dolphins was not extended to save sharks

A.完整、完整性差、较破碎、破碎

B.完整、较完整、较破碎、破碎

C.完整、较完整、完整性差、较破碎、破碎

D.完整、较完整、完整性差、破碎

在进行试样的破碎时，要求过筛的目数越小，试样破碎得越细。( )

在进行试样的破碎时，试样破碎得越细，过的筛目数越大，分析结果越准确。 ( )