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问题 选择题

（09台州）如图所示，一杯刚配制的饱和蔗糖溶液，要增加该溶液的溶质质量分数，下列操作正确的是 (   )

A．升温

B．降温

C．加糖

D．搅拌

答案

答案：A

① 相关知识点：溶质的质量分数的应用② 解析思路：一般情况下，饱和溶液的溶质质量分数是不变的，只有升温，增大溶解度才能溶解更多的溶质，增大溶液的溶质质量分数。

单项选择题

下列属于对项目用水合理性分析的是（）。

A.建设项目现状供用水情况及开发利用程度分析

B.建设项目开发利用水资源对取水水源的影响分析

C.建设项目退（排）水情况及其对水环境的影响分析

D.建设项目取水水源论证及其对其他用水户的影响分析
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单项选择题

Questions 21～25


While other members of my team explored the wreck of a small Greek merchant ship that sank off the Turkish coast more than 2,400 years ago, I hovered above them in a submarine. One diver, an archaeologist, placed an amphora, or two-handled jar, inside a lifting basket. Another vacuumed sediment from the site by fanning sand into the mouth of a nearly vertical pipe. Two more were taking measurements, carefully, but of necessity quickly, for at this depth each diver had only 20 minutes to complete the morning’s assigned task. Any longer, and they would require lengthy medical treatment, to avoid the divers’ ailment known as the bends.
In four decades of diving on shipwrecks, I’ d been too engrossed in carrying out similar tasks to think of the families whose loved ones may have disappeared long ago. I had always concentrated on the technical features of my trade. I had stopped diving regularly 15 years before this exploration, turning over the bulk of the underwater work to a younger generation, but I continue to make inspection dives on most wrecks we excavate.
This was not just any wreck. Although I’ve been involved in uncovering the remains of much older ships, and of more than a hundred ancient shipwrecks along the Turkish coast. I had never even seen a wreck from the fifth century BC. Preliminary photographs of the cargo dated it to the third quarter of the century, during the Golden Age of classical Greece. Athens, then as now the major city in Greece, controlled an empire stretching from one side of the Aegean Sea to the other. None of this would have been possible without naval might and maritime commerce.
During our three-year exploration of the wreck we excavated examples of nearly every type of jar that the classical Greeks made for wine or water. Many types might have been used as tableware by the ship’s crew, but they were far in excess of what would have been required. We concluded therefore that they must have been cargo. We also discovered in the seabed two marble discs, which we guessed were the ship’s eyes. It has long been known from vase paintings that classical Greek ships—like those from other cultures—had eyes to give them life or help them see their way through the waves. Although warships were known to have had naturalistic marble eyes attached to them, most scholars assumed that the eyes on more modest merchant ships were depicted as simple circles painted onto the sides of the vessel.
Did the sailors who depended on these eyes for safety survive the ship’s last voyage They could have lived through the actual sinking. The ship was less than a hundred yards from land when it sank, so they might have swum towards the shore. And we know from Greek literature that some ships had lifeboats. But proximity to land and having lifeboats are no guarantee of safety. Even if some had swum to shore, it’s hard to imagine that many managed to crawl up on the exposed and sharp rocks while being smashed by waves like those that almost certainly sank their ship.

The writer uses the words’not just any wreck’ in paragraph 3 to imply that ______.

A. he had been searching for the ship for a considerable time
B. this was not the only ship found off the coast of Turkey
C. finding this particular ship was of exceptional significance
D. the ship was in better condition than most wrecks
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