自动推力工作的情况下，按压FCU面板上的ATHR按钮（）

A than

B as

C in

D for

A their

B your

C our

D her

A theory is a good theory if it satisfies two requirements: It must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future conservation. Newton' s theory of gravity was based on an even simpler model, in which bodies attracted each other with a force that proportional to a quantity called their mass and inversely proportional to the square of the distance between them.

A．at random

B．at hand

C．at a loss

D．at large

A The earliest carnivals were held in ancient Rome

B Carnivals were originally a tradition of the Brazilians

C Carnivals were originally a tradition of the Romans．

D The Brazilians have integrated the Roman carnival into their culture．