________ is the center of our planetary system was a difficult concept to grasp in
A) It is the sun and not the earth
B) Being the sun and not the earth
C) The sun and not the earth
D) That the sun and not the earth
A) It is the sun and not the earth
B) Being the sun and not the earth
C) The sun and not the earth
D) That the sun and not the earth
A.independently
B.individually
C.irrespectively
D.rregularly
A) over
B) than
C) up
D) beyond
A、like
B、as if
C、even if
A.20 dollars.
B.6 dollars and 50 cents.
C.5 dollars and 25 cents.
D.4 dollars and 75 cents.
A.drop
B.not change
C.rise
D.exceed 2 per cent
The word “this” (Para. 3, Line 1) the author means to say that ________.
A) there are more men on any given job than are needed
B) 33 per cent overmanning leads to 33 per cent less productivity
C) it is difficult to measure the intensity of work
D) Britons generally do not want to work too hard
Which of the following statements about the standard 90 db is NOT true?
A.It suits everyone.
B.It can protect only 90 per cent of the working force.
C.It requires 16 quiet hours of rest each day for the ears to recover.
D.It can hardly be applied in reality.