The first paragraph mentions three ways of activating the saliva in the mouth．
A. True
B. False
C. Not mentioned
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请选择（3）处的最佳答案．
A. on
B. in
C. at
D. about
In the doctor's view,_________
A. there are both advantages and disadvantages of being rich.
B. traveling a lot will be beneficial to children.
C. rich children usually.have little confidence in themselves.
D. rich kids are often short of money because of their life of luxury.
请选择（7）处的最佳答案．
A. plant
B. jobs
C. machines
D. themselves
With John Cabot's arrival at an island off the New England coast in 1497, the British Crown claimed to be the legal owner of North America.
A. Right
B. Wrong
C. Not mentioned
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