单项选择题

Some scientists believe that altering genes to extend life span may not be().

A. high above
B. well back
C. better off
D. far off

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单项选择题

There are some people who have lived () over 100 years while enjoying good health.

A. as many as
B. as much as
C. as long as
D. as far as

单项选择题

Those with graduate parents may ().

A. make poorer choices when choosing their majors
B. make better choices when applying for higher education
C. not need career guidance before graduation
D. have no problems in applying for a college