单项选择题：血液成分中在止血、伤口愈合等方面祈祷重要作用的是（）。 A.血小板 B.白细胞 C.

题型：选择题

图1中箭头表示地球自转方向，O点表示极点。读图完成第18-20题。

小题1:若A点的正午太阳高度为0°，下列叙述正确的是（）

①北半球各地正午太阳高度达一年中最大值

②南半球各地正午太阳高度达一年中最小值

③南半球大陆等温线向高纬凸出

④地中海沿岸正处于少雨季节

A．①②

B．②④

C．③④

D．①④小题2:若A点正午太阳高度角为46°52’，下列叙述可信的是（）

①长江口外东海海域盐度为一年中最大值 ②长江中下游地区正值梅雨季节

③我国各地均昼夜平分 ④巴西高原草木茂盛

A．①②

B．②③

C．③④

D．①④小题3:若ON、OM为地球昨天和今天的分界线，且西半球有很小的一部分位于阴影范围，下列叙述正确的是（）

①阴影部分为昨天 ②东半球中有5／9位于今天

③此时北京时间为4时 ④A点昼夜等长

A．①②

B．①③

C．①④

D．②③

查看答案

题型：阅读理解

The following are the sculptures in the Underwater Museum, which are accessible in person by glass boat, or scuba diving.
	The Archive of Lost Dreams The Visual: It describes an underwater archive of messages in bottles. The Meaning: The bottles contain messages of dreams for future generations. The Hope: The statue is placed with the purpose of helping draw visitors away from the healthy parts of the reef. The Location: The Archive of Lost Dreams was placed 8 meters deep at Manchones Reef, close to Isla Mujeres. Behind the Scenes: The collection of bottled messages were provided by various communities who wrote about today’s values and their dreams for the future generations.
	The Gardener of Hope The Visual: Here a young Mexican girl lies in a garden surrounded by pots which will be grown with live coral. The Meaning: The young girl in the sculpture represents a model for hopeful future generations. The Hope: The base of the Gardener of Hope was built to attract various marine creatures. The coral in the pots is also expected to grow. The Location: The Gardener of Hope was placed 4 meters deep at Punta Nizuc near the coast of Cancun. Behind the Scenes: The pots here are filled with live coral cuttings that were saved from areas of the local reef system.
	Man on Fire The Visual: Man on Fire describes a lone male figure covered in live fire coral to resemble fire. The Meaning: The sculpture symbolizes the unawareness of the “fire” our generation has started with the over use of limited natural resources. The Hope: Man on Fire has 75 holes planted with small live cuttings of fire coral which are expected to grow like fire. The Location: Man on Fire was installed 8 meters deep at the Manchones Reef nearby to Isla Mujeres. Behind the Scenes: The sculpture was cast from a local Mexican fisherman and it weighs over 1 ton.
	The Silent Evolution The Visual: Here more than 400 sculptures depict the timeline of human nature. The Meaning: It is a documentation of how society and people have changed over time. It is also to remind us of how we are connected to nature. The Hope: The installation is designed for forming a complex reef structure that marine life will claim as its own and inhabit. The Location: The Silent Evolution will be installed 8 meters deep behind the Manchones Reef. Behind the Scenes: The total installation will expand over 150 square meters and will weigh over 120 tons.
Attention: Guided tours are a must. You can catch a tour from Aquaworld, which leaves every hour from 9 a.m. to 3 p.m. daily.