Heat does not travel by convection in a solid, because the solid does not move, _____

A.Radiation

B.Conduction

C.Natural convection

D.contact directly

A.spend

B.want

C.take

D.make

A.want

B.make

C.spend

D.take

A.A fat female who studies hard．

B.A thin female who does not study．

C.A fat male who does not study．

D.A thin male who studies hard．

A、want

B、spend

C、take

D、cost

A.When does

B.Which's

C.What's

D.Where is

What does the author think of private space travel？

A.It is worth promoting despite the risks involved.

B.It should not be confined to the rich only.

C.It should be strictly regulated.

D.It is too risky to carry on.

A．When the nightclubs are closing

B．Eight o’clock in the morning

C．When the train is overcrowded

D．When people travel to and from work

A．It attracts more people to travel by train

B．It damages company-customer relations

C．It makes the company lose a lot of money

D．It protects honest ticket-paying passengers