题目内容：

Directions: Read the following passage. Fill in each blank with a proper sentence given in the box. Each sentence can be used only once. Note that there are two more sentences than you need.

The Ban on Trading Ivory(象牙) is Unfair but Necessary

As in some countries elephant population have recovered, there are competing proposals about how absolute the ban on elephant trading should be. Countries seeking a modest relaxation have a strong case to make. But it is not strong enough. The ban must stay.

Understandably, countries that have done a good job protecting their elephants feel this is unfair. 1. And the real burden of all this is borne by poor local people who are in competition with wildlife for resources, and sometimes in conflict with it—elephants can be destructive. People and governments, so the argument goes, need to have an economic stake(利害关系) in the elephants’ survival. The ivory trade would give them one.

To understand why these reasonable-sounding proposals should be rejected, consider what

has happened to elephant numbers since some legal trade was authorised, when Botswana, Namibia and South Africa were allowed in 2007 to sell a fixed amount of ivory to Japan. 2.

  A survey conducted in 2014-15 estimated that elephant numbers had fallen by 30% across 18 countries since 2007.

3. In better-resourced national parks, drones are used to make it easier for park keepers to spot illegal hunters. DNA testing of ivory can identify where they came from, and thus whether they are legal. As prices of the technologies fall and countries get richer, both technologies are likely to spread.

The objection to trade in products of endangered species is not moral. When the world is confident that it will boost elephant numbers rather than wipe them out, the ivory trade should be encouraged. 4. And until it does, the best hope for the elephant—and even more endangered species, such as rhinos(犀牛)—lies not in easing the ban on trading their products, but in enforcing it better.

A. Regrettably, that point has not yet come.

B. Elephant numbers started falling.

C. The existence of even a small legal market increases the opportunities for illegal trade.

D. They point out that they have devoted huge resources to the elephant.

E. In the long run technology can help make trade coexist with conservation.

F. One animal, as so often in the past, will attract much of the attention: the African elephant.