所谓理想约束，是指在任何虚位移中，约束反力所作虚功之和等于零的约束（)。

My little brother bas never been to Beijing, but it's the place ______ .

A．where he'd like to visit

B．he most wants to visit

C．in which he'd like to visit

D．that he wants to visit it most

A．upcoming

B．probable

C．concerning

D．previous

______ was the most interesting feature of the Oxford English Dictionary.

A．A complete list of difficult words

B．Containing sentences that showed how each word was actually used

C．A 20-voltume work

D．Showing word histories

The boy showed complete ______ of his parents' advice.

A．ignorance

B．disregard

C．neglect

D．avoidance

The boy showed complete ______ of his parents' advice. ()

A．ignorance

B．disregard

C．neglect

D．avoidance

A、Thomas Carlyle

B、John Ruskin

C、Charles Kinsley

D、Matthew Arnold

______ he did not come to work yesterday, be showed that he is not very interested.

A．For that

B．Now that

C．Since that

D．In that

______a good student but he also proved himself a good sportsman.

A．He showed himself not only

B．He showed not only himself

C．Not only did he show himself

D．Not only he showed himself

He showed ______ in dealing with a defeated enemy.

A.generous

B.generosity

C.generate

D.generation

He showed his ______ by nodding his head. (agree)