Beavers (河狸) are cute animals. They are brown. They have big teeth and a flat tail. Beavers are good at building dams (筑坝). They use wood and stones to build dams in rivers. The dams are their homes. They live in the dams with their families. I think beavers are very smart. I like them a lot!

1.1.What color are beavers?

A Black.

B Brown.

C White.

D Yellow.

解析：选B。B 细节理解题。题干问河狸是什么颜色，答案可以直接从短文中的“They are brown.”得知。这句话明确告诉我们河狸是棕色的，所以B选项正确。A选项黑色、C选项白色和D选项黄色在文中均未提及。故选B。

2.2.Beavers use ______ to build dams.

A leaves and grass

B water and mud

C wood and stones

D paper and sticks

解析：选C。C 细节理解题。题干问河狸用什么来筑坝，短文直接给出了答案：“They use wood and stones to build dams in rivers.”。这句话表明它们使用木头和石头，因此C选项正确。A选项树叶和草、B选项水和泥、D选项纸和棍子在文中完全没有提到。故选C。

3.3.The dams are beavers’ ______.

A schools

B shops

C parks

D homes

解析：选D。D 细节理解题。题干问水坝是河狸的什么，短文中提到：“The dams are their homes. They live in the dams...”。这直接说明了水坝就是它们的家，因此D选项正确。文中没有提到水坝是学校、商店或公园。故选D。

4.4.The writer thinks beavers are ______.

A clever

B big

C small

D funny

解析：选A。A 细节理解题。题干问作者认为河狸怎么样，答案需要理解文中的“I think beavers are very smart.”的意思。这里的“smart”是聪明的意思，与A选项“clever”（聪明的）意思相同，是近义词替换。B选项大的、C选项小的、D选项有趣的，都不符合“smart”在文中的含义，也不是作者表达的看法。故选A。