The ancient Romans believed that their sea-god, Neptune, rode in a chariot led by these magical creatures. They seem an unlikely mix of characteristics — the majestic head of a dragon leads down to the prehensile（能卷抓的）tail of a monkey. Their skin, stretched over a knobby skeleton, resembles the armor of an insect. And free-moving eyes circle like those of a chameleon（变色龙）. Yet seahorses are simply a type of fish. Their habitats range from the shores of Nova Scotia as far south as Tasmania, from the shallows of the Mediterranean, to the English Channel. Somewhere in the beds of most coastal waters, seahorses can be found. To maneuver in their seabed homes, seahorses are designed for stability rather than speed. A dorsal fin（背鳍）propels them forward, while two small side fins allow them to turn and steer. They spend most time anchored to whatever hold is handy — seagrass, sponge, or soft coral. From their mooring points, they rove out to catch small creature floating by. Seahorses have neither teeth nor stomach, yet somehow manage to digest thousands of shrimp a day. With independent eye movement, they can search for food while also looking for danger. To protect against predators, seahorses are masters of camouflage（伪装）. Some allow algae（水藻）to grow on their skin, developing appendages（附属物）that blend with weeds and grasses. To the untutored eye, seahorses are virtually invisible, blending in with the seagrass that they inhabit. Every morning, each seahorse does a greeting dance with its partner. The couple entwine tails and march through the seagrass together. Seahorses make the most faithful of partners. They pair up for life and scorn all others.

1.Which of the following is NOT the features of seahorses?

A. They have a majestic head of a dragon.

B. Their skin resembles a knobby skeleton.

C. Their tail is like the monkeys’tail.

D. Their eyes can move freely.

Best Answer:B

详解：答案B。文中第二、三、四句描述的就是海马的外貌特征。其中写到：the majestic head of a dragon, the prehensile tail of a monkey, free-moving eyes,可见海马有着龙一般威严的头和猴子一样蜷曲的尾巴、自由转动的眼睛,A,C,D项符合文中的描述，故不选。文中指出，海马的皮肤覆盖在多节骨架上，像昆虫的盔甲。但这并不表示海马的皮肤像多节骨架，故B项为本题答案。

2.How many fins does a seahorse have?

A. one

B. two

C. three

D. four

Best Answer:C

详解：答案C。文中写到:A dorsal fin propels them forward, while two small side fins allow them to turn and steer,可见一只海马有三个鳍。C项为正确答案。

3. What part does seahorses not have?

A. mouth

B. Teeth and stomach.

C. Eyes.

D. Ears.

Best Answer:B

详解：答案B。文中写到：Seahorses have neither teeth nor stomach, yet somehow manage to digest...，可见海马没有牙齿和胃，B项符合，为正确答案。海马有无mouth和ears在文中未提及，故不选。

4.Seahorses are often invisible because ________.

A. they are transparent

B. they change their skin color

C. they swim fast

D. they are blending in with the seagrass that they inhabit

Best Answer:D

详解：答案D。文中写到To the untutored eye, seahorses are virtually invisible, blending in with the seagrass that they inhabit，可见外行的人通常是看不到海马的，它们躲藏、居住在海藻中。D项符合，为正确答案。A,B,C项在文中未提及。

5.Which of the following is NOT correct in describing seahorses’ marriage?

A. They twist together their tails all the time.

B. The couple go through the seagrass together.

C. They are faithful to each other.

D. They do a greeting dance every morning.

Best Answer:A

详解：答案A。本题用排除法较好。从文章倒数第三句可知B项正确。从倒数第二句可知C项正确。从倒数第四句可知D项正确。A项错在all the time。