What makes Apple stand out from other tech firms？ 查看材料
A. The total sales of iPhones all over the world．
B. Its successful occupation of market share in China．
C. No shifting of goods around．
D. Its constant developing of new products．
查看答案
RNA组成成分()。
A. 葡萄糖
B. 核糖
C. 脱氧核糖
D. 糖原
E. 糖脂
The author cites Mr．Cook‘s words in Para 1 in order to__________．
A. show how popular iPhone is
B. show how much money Apple makes
C. reveal how smart chief executives are
D. reveal how the company is run
It is implied in the passage that__________． 查看材料
Apple"s online store of software apps is always busy
B. Apple"s smartwatch will reduce its dependence on the iPhone
C. shifting goods around eats away at Amazon"s profits
D. the outlook of software-based firms is quite uncertain
蛋白质的三级结构是()。
A. 氨基酸的种类和排列顺序
B. α螺旋、β折叠和π螺旋
C. 球形蛋白质
D. 亚基集结
E. 变性
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