ZOO

The WZCS estimates that there are about 10000 zoos in the world, of which around 1,000 represent a core of quality collections capable of participating in co-ordinated conservation programmes.


對這段話的理解
WZCS估計有世界上大約有10000間動物園,期中1000間動物園具備參與保育計畫的能力.

中間那段" of which around 1,000 represent a core of quality collections",我一直看不太懂


這邊可以找到參考原文:
http://www.proficiency-test.com/2010/05/27/ielts-reading-sample/

Drink water

此處的when昰做連接詞嗎?

總覺得有連接詞,前後都需要有動詞.

"exercise"昰在怎樣的情況下變成exercising?

Some recommend drinking up to  12 cups a day when exercising in the hot sun.

另外,這句話可以把"up to"拿掉嗎?例如:

Some recommend drinking 12 cups a day when exercising in the hot sun

Italian job done

這是某個體育新聞的標題.
我大概猜的出來其意思是"義大利已取得決賽資格",不過對於"nothing as" 的用法不是很清楚,
上網找了一下都是Pearl Jam的歌 "Nothing As It Seems"


Form in the group stage means nothing as Italy head into the quarters.
http://espnfc.com/en/features/1108046/roberto-gottaitalian-job-done-now-business.html