日本传统的民居，多是用质地较轻的建筑材料建筑的，以减轻_________灾害造成

阅读短文，根据短文内容回答问题。（共10分，每小题2分）

We’ve all heard of mermaids. They are the beautiful half-human, half-fish creatures(生物). They have the head and body of a human and the tail of a fish. We also know that mermaids only exist in fairy tales. But where did all the stories about these creatures come from? If you have ever seen a manatee, then you might have an idea.

Manatees, which are also called sea cows, are mammals(哺乳动物) that live in the sea. Since they are mammals, they have to swim up to the surface to breathe air. Many people believe that the story of the mermaid began with the ancient sailors who saw the manatees putting their heads out of the water to breathe. Because manatees are upright when they do this, it looks like they are standing. If a sailor saw a manatee doing this from far away across the sea, it is possible that the sailor would mistake the manatee for a creature that is half-human, half-fish.

Mermaids are described as having very long hair. This is probably because manatees like to swim up to the surface of the water in areas where there is sea grass. Manatees eat all kinds of plants in the sea, including sea grass. The sea grass around the manatee’s head when they eat could create a picture of long hair.

Manatees also have powerful tails that are very similar to the fish-like tail of a mermaid. The sailors probably watched manatees come up for air and then swim back below the surface, using their paddle-shaped tails. This would explain why the sailors thought mermaids had fish-like tails.

小题1:What are mermaids?

小题2:Where do manatees live?

小题3:Do manatees need to breathe air out of water?

小题4:What do manatees eat?

小题5:Why did the ancient sailors mistake manatees for mermaids?

性状上具有“白颈”特征的中药材是

A．水蛭

B．广地龙

C．全蝎

D．蜈蚣

E．僵蚕

一患者诊断为胃十二指肠溃疡急性穿孔，在送往医院途中，患者体位应为

A．平卧位
B．左侧卧位
C．俯卧位
D．右侧卧位
E．半卧位

下列哪种食物中富含最理想的天然优质蛋白质（）

A、牛奶

B、牛肉

C、鸡蛋

D、鱼肉

选择固定桥基牙的最低限度是（）。

A.冠根比为1：1

B.冠根比为1：2

C.冠根比为1：3

D.冠根比为2：3

E.冠根比为2：1