单项选择题

59（）

A．waste
B．purchase
C．earn
D．omit

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单项选择题
While sleeping, some water mammals tend to keep half-awake in order to ______
A．alert themselves to the approaching enemy
B．emerge from water now and then to breathe
C．be sensitive to the ever-changing environment
D．avoid being swept away by rapid currents
单项选择题
Which of the following statements is NOT true according the passage
A．The author has worked in China for 37 years.
B．Cycling is not as safe as it was in the 1960s.
C．The unique character of the old Beijing is disappearing.
D．You cannot buy anything you like though you have money.
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