单项选择题


Questions 18-21 are based on the following passage. You now have 20 seconds to read the questions 18-21.
How many cats can survive a fall from two or three storeys

A．100%.
B．50%.
C．90%.
D．10%.
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单项选择题
A．sendB．shootC．launchD．throw
A．send
B．shoot
C．launch
D．throw
单项选择题
In the United States, medical treatment is ______.
A．very effective
B．cheap
C．insufficient
D．expensive
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