Scientists _________ the animals’ environment in order to study them.

The scientists(success) ______ launched the satellite in spite of all the difficulties．

Many scientists have been probing psychological problems.

A．solving

B．exploring

C．settling

D．handling

Scientists are trying to make ______ investigation.

A．further

B．farther

C．furthest

D．farthest

The scientists discovered DNA that _____belonged______to the phone's speaker on each of the phones

A.moved

B.changed

C.belonged

D.turned

A.scientists

B.people

C.men

D.women

Scientists doubt whether it's______to regulate one's biological clock by drinking.

A．feasible

B．incredible

C．fashionable

D．valuable

A.handed

B.drew

C.handled

D.approached