Which statement of the following is true？
All the cases of black people's escape are true.
B. All the assistance to slaves was given by Underground Railroad.
C. The escaping slaves usually went to Canada by train.
D. It is a metaphor to call the person who gave help to the escaping slaves conductor.
查看答案
A．willB．shouldC．mayD．can
A. will
B. should
C. may
D. can
According to the Los Angeles study, immigrants ______.
A. sometimes help to maintain the existence of some industries
B. sometimes cause employment to fall
C. may lower the wages of natives in general
D. may help promote inflation
A．unsettlingB．unbelievableC．unworkingD．understanding
A. unsettling
B. unbelievable
C. unworking
D. understanding
The kind of air pollution that is most harmful to health is caused by ______.
A. lead emissions
B. carbon-dioxide emissions
C. sulphur dioxide emissions
D. small particles
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