一、请把下列动词或形容词变成名词形式
1. begin
2. happy
3. introduce
4. decide
5. feel
6. protect
7. kind
8. invite
9. spell
10. invent

1.beginning；2.happiness；3.introduction；4.decision；5.feeling；6.protection；7.kindness；8.invitation；9.spelling；10.invention

1.begin→beginning（动词变名词，去e加ing）；2.happy→happiness（形容词变名词，变y为i加ness）；3.introduce→introduction（动词变名词，去e加tion）；4.decide→decision（动词变名词，去e加sion）；5.feel→feeling（动词变名词，直接加ing）；6.protect→protection（动词变名词，加ion）；7.kind→kindness（形容词变名词，加ness）；8.invite→invitation（动词变名词，去e加tion）；9.spell→spelling（动词变名词，直接加ing）；10.invent→invention（动词变名词，加ion）。

二、用括号内所给单词的适当形式填空
Wild animals are of great (1) (important) to our world. They make our earth full of life and beauty. But today, many wild animals are in danger.
One big problem is that people are cutting down too many trees. This makes the wild animals lose their homes. Another problem is (2) (hunt). Some people kill wild animals for their fur, horns, or meat. Air (3) (pollute) is also bad for wild animals. It makes the whole environment worse for all (4) (live) things.
We must take (5) (act) to protect wild animals. First, we should stop cutting down so many trees and plant more trees to give wild animals a better home. Second, the government should make stronger laws to stop illegal hunting. Finally, we need to raise people's (6) (aware) of protecting wild animals, teaching everyone that wild animals are our friends, and we should live with them in harmony.

(1) importance
(2) hunting
(3) pollution
(4) living
(5) action
(6) awareness

(1) "be of great importance" 是固定搭配，意为“非常重要”，important是形容词，此处需用名词形式importance。
(2) 此处作表语，应用动名词形式hunting，说明另一个问题是捕猎这种行为。
(3) "Air pollution" 表示“空气污染”，pollute是动词，此处需用名词pollution。
(4) "living things" 意为“生物”，live是动词，此处需用形容词living作定语修饰things。
(5) "take action" 是固定短语，意为“采取行动”，act是动词，此处需用名词action。
(6) "raise one's awareness" 意为“提高某人的意识”，aware是形容词，此处需用名词awareness。

三、完形填空
Polar bears are one of the most amazing and unique animals on Earth. They are large mammals that live in the Arctic region, surrounded by ice and snow. These beautiful creatures have several 1 features that help them survive in such a cold environment.
First, polar bears have very thick fur. Each hair is hollow, trapping air to 2 them warm. This fur makes them look white, although their skin is black. Under their fur, they have a very thick layer of fat, up to 10 cm in some body parts. This fat provides energy when food is hard to find.
Another interesting thing about polar bears is their diet. They mainly 3 seals. Polar bears are excellent hunters. They use their strong sense of smell to detect seals from far away. Then, they patiently wait near the seals' breathing holes in the ice. When a seal comes up to breathe, the polar bear quickly 4, using its powerful claws and sharp teeth.
Polar bears are also great swimmers. Their large, flat feet act like paddles, allowing them to swim long distances in the cold Arctic waters. They can swim at a speed of about 10 km/h and can cover distances of up to 100 km without 5.
However, polar bears are facing serious threats today. Global warming is causing the Arctic sea ice to melt at an alarming rate. 6 polar bears depend on the sea ice for hunting, traveling, and resting, the loss of sea ice is making it harder for them to find food and survive.
We need to 7 to protect the polar bears and their habitat. This includes reducing our carbon emissions to slow down global warming and making sure that the Arctic 8 is not further damaged. Otherwise, these magnificent animals may disappear from our planet in the future.
To help polar bears, scientists are also studying their 9 and behavior to better understand their needs. Governments and environmental groups are working together to create 10 areas for polar bears to live in.
( ) 1.
( ) 2.
( ) 3.
( ) 4.
( ) 5.
( ) 6.
( ) 7.
( ) 8.
( ) 9.
( ) 10.

1. D
2. B
3. A
4. C
5. B
6. C
7. C
8. B
9. A
10. B

1. 文中提到北极熊在极冷的环境中生存，需要特殊的特征来适应，因此选择“special”（特殊的）最为恰当。
2. “keep warm”是固定搭配，表示“保持温暖”，符合题意。
3. 根据上下文，北极熊主要以海豹为食，所以选择“live on”（以…为食）。
4. 北极熊在发现海豹后迅速攻击，使用“attacks”（攻击）符合捕猎行为的描述。
5. 文中提到北极熊可以连续游泳而不停止，因此选择“stopping”（停止）。
6. 北极熊依赖海冰生存，海冰的消失导致它们难以生存，这里表示因果关系，所以用“Because”（因为）。
7. 文中提到需要采取措施保护北极熊，因此选择“take action”（采取行动）。
8. 保护北极熊需要确保其环境不再受损，因此选择“environment”（环境）。
9. 科学家研究北极熊的习性以更好地理解它们的需求，选择“habits”（习性）。
10. 为了保护北极熊，需要创建安全的居住区域，所以选择“safe”（安全的）。