题目内容：
Questionsare based on the following passage．Never before has so much money been made by a single firm in such a short period of time．OnJanuary 27th Tim Cook, the boss of Apple, announced that it had made $18 billion in its latest financialquarter．Apple's telephone-number-sized profit stemmed largely from sales of its hugely popular iPhone, which accounted for over two-thirds of its $ 74．6 billion revenue．Chief executives rarely admit to being shocked by their companies' performance, but Mr．Cook said it was "hard to comprehend" the extent of the interest in Apple's products．He noted that, on average,34,000 iPhones were bought every hour of every day during the latest quarter．
Apple is the world's largest company by market capitalisation (总值) as well as its most profitable．Strikingly, it has risen to greatness using a rather old-Fashioned business model: sellinghighly desirable objects at fat gross margins, which hit almost 40% in the latest quarter．The tech
industry has bred numerous software-based finns, such as Google and Facebook, that don't have to worry about shifting goods around, yet they make much less than the Colossus of Cupertino．Amazon handles lots of physical goods, but loses money．
Another thing that sets Apple apart from the tech pack is its success in conquering China．Whilerivals have been frustrated there, Apple has just become the largest force in China's smartphone market measured by units shipped, according to Canalys, a market-research firm．Any failure in China could hurt Apple．The company's overall dependence on the iPhone is anotherrisk．But these are early days for the iPhone 6, Apple's latest device, whose bigger screen takes the firminto the "phablet" (平板手机) category of larger phones that are wildly popular with customers．Some
iFans also point out that Apple's share of the smartphone market is small compared with devices using Google's Android operating system．So it has plenty of room to grow．Mr．Cook said this week that its much-anticipated smartwatch will go on sale in April．Tim Bajarin of Creative Strategies, a consulting ftrm, thinks Apple could sell 22m -24m in the first 12 months after
the launch, producing billions of dollars of new revenue．Sanford C．Bernstein, a research firm, reckons the watches will have a higher-than-average gross margin, which predicts good profits．Apple should be able to make more money from software and services, too．
A large part of Apple's fat profit comes from__________． A．the sales of its smartwatch
B．the sales of its software
C．the sales of its service
D．the sales of its iPhone
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