Just as a force is required to change the speed of an object, ______

单选题 Just as a force is required to change the speed of an object, __________ a force must act to cause a change in the direction of the motion.

A．as
B．thus
C．so
D．like

参考答案C

解析:

单选题 Some companies have introduced flexible working time with less emphasis on pressure __________

A．than more on efficiency
B．and more on efficiency
C．and more efficiency
D．than efficiency

单选题 __________ he is still young, he is going very grey.

A．As long as
B．As
C．While
D．Even

单选题 Criticism and self-criticism is necessary __________ it helps us to fired and correct our mistakes.

A．by that
B．at that
C．on that
D．in that