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The heaviest pair of giant pandas in the world were born on Saturday at a breeding center in Chengdu in Western China. They weighed about the same as a football at birth. The twin cubs weighed in at 7.5 ounces and 7.4 ounces, respectively, the Chengdu Research Base of Giant Panda Breeding reported on Thursday. The average weight of a newborn panda is roughly five ounces.

It took the pair's mother, Po, about five hours to give birth to the pair, after her water broke at 4.47 am local time. The male cub was born first at 7.14 am and the female followed at 9.28 am. The mother at once warmed her newborn cubs, holding them in her arms and licking them as soon as she could recover the energy.

The cubs have an American connection through their mother. Po was born at Atlanta Zoo on November 3, 2010. Originally thought to be male, she was named after the lead character in the movie Kung Fu Panda, which was released in 2008. Po was later transferred to the Chengdu center. The twins’ father, Yingying, and his twin sister also both weighed more than seven ounces at birth, which is highly unusual. Yingying weighed 7.3 ounces and his sibling, Nini, weighed 7.1 ounces.

With the birth of the twins, the center’s population hit 200 giant pandas. The center welcomed the giant panda cub in the world last month. A female panda cub named Cheng Lang weighed just over 1.5 ounces at her birth on June 11. That's roughly one-third of the average weight of a panda cub, according to the center’s chief, Zhang Zhihe. It's also just shy of the weight of a golf ball.

1.The underlined word “cubs” may refer to ______.

A footballs

B centers

C pandas

D ounces

解析：选C。C 词义猜测题。根据文章第一段第一句The heaviest pair of giant pandas...可以得知这里的cubs是指前面提到的出生最重的熊猫双胞胎，故选C。

2.What did the mother panda do after the twins were born?

A She weighed them.

B She followed the male cub.

C She milked them soon.

D She got them warm quickly.

解析：选D。D 细节理解题。根据文章第二段第三句The mother at once warmed her newborn cubs...可以得知熊猫妈妈立刻给宝宝取暖，故选D。

3.Why did the panda mother get the name of Po?

A She got her name from a film.

B She was born in Chengdu.

C She was named after Yingying.

D She was fond of the film.

解析：选A。A 推理判断题。根据文章第三段第三句...she was named after the lead character in the movie Kung Fu Panda...可以得知熊猫妈妈的名字Po以电影《功夫熊猫》中的主人公命名，故选A。

4.What was the name of the lightest panda at birth in the world?

A Yingying.

B Chenglang.

C Po.

D Nini.

解析：选B。B 细节理解题。根据文章最后一段A female panda cub named Cheng Lang weighed just over 1.5 ounces at her birth on June 11. That's roughly one-third of the average weight of a panda cub...可以得知Cheng Lang出生时约是熊猫幼崽平均体重的三分之一，是出生最轻的熊猫，故选B。