A set of panda triplets, known as the world's only surviving trio（三胞胎）, have opened their eyes for the first time more than a month after their birth in a Chinese zoo.

The mother panda, named Juxiao, meaning "chrysanthemum smile", delivered the triplets（三胞胎之一）at Guangzhou's Chimelong Safari Park in the early hours of July 29. And the trio's births were seen as a "miracle" because of the low reproductive（生产，繁殖）rate.

The three cubs covered with white and black fur are now squealing moving about with their eyes open. The second panda to be born was the first to open its eyes, followed by the lastborn and then the firstborn. Each one is starting to show its own individuality. For example, the third one is the liveliest. The cubs' next stage in development will be to start walking. The gender of the cubs cannot be determined until they grow older.

The first known case of triplets from a giant panda was recorded in 1999, when a 15-year-old mother gave birth in the southwestern Chinese city of Chengdu. However the youngest of the trio died after living for just three days because of a bladder disorder.

Pandas, whose natural habitat lies in mountainous southwestern China, have a notoriously low reproductive rate and are under pressure from factors such as habitat loss. China now only has about 1,600 pandas living in the wild.

Their normal breeding season is mid-April to May.

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1.When were the pandas born?

A A week ago

B A month ago

C More than a month ago

D Almost a month ago

解析：选C。C 细节理解题。从文章第一段可知，熊猫三胞胎已出生一个多月了，故选C。

2.Where were the panda triplets born?

A In Sichuan

B In Guangzhou

C In Shanghai

D In Beijing

解析：选B。B 细节理解题。从文章第二段可知熊猫三胞胎是在广州长隆野生动物园出生的，故选B。

3.Who was the first to open its eyes?

A The firstborn panda

B The secondborn panda

C The thirdborn panda

D We don’t know

解析：选B。B 细节理解题。从文章The second panda to be born was the first to open their eyes, followed by the lastborn and then the firstborn可知，故选B。

4.Which of the following is TRUE?

A Giant pandas give birth very easily.

B The three cubs will learn to feed themselves next.

C Two of the three cubs are male.

D One of the panda triplets died of bladder disorder in 1999.

解析：选D。D 细节理解题。从文章可知，大熊猫繁殖率低，故A选项错误；熊猫三胞胎下一步将学走路，故B选项错误；由于年龄太小，熊猫三胞胎性别还无法判断，故C选项错误；从第四段可知，D选项正确，故选D。

5.Pandas usually give birth in ________.

A spring

B summer

C autumn

D winter

解析：选B。B 细节理解题。从最后一段Their normal breeding season is mid-April to May可知，故选B。