单项选择题

Questions 26 to 28 are based on the passage you have just heard.

A．Arrive early for boarding.
B．Carry little luggage.
C．Undergo security checks.
D．Arrive late for boarding.
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单项选择题
A．In the 17th century.B．In the 1Sth century.C．In the 18th century.D．In the 16th century.
A．In the 17th century.
B．In the 1Sth century.
C．In the 18th century.
D．In the 16th century.
单项选择题
What have Christopher Ross’ experimental results revealed to us
A．Those inheritable diseases may be cured through genetic testing.
B．Those inheritable diseases may be predicted through genetic testing,
C．Those inheritable diseases may be prevented through genetic testing.
D．Those inheritable diseases may be controlled through genetic testing.
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