A new study shows mothers matter all year long and not just on Mother "s Day． The emotional，physical and mental energy mothers devote to their children can be never-ending， but children are also sources of great joy and happiness． Investing（投入） in time for parenting and raising relationships is money well spent．
Mothers have long known that their home workload was just as heavy as paid work． Now， the new study has shown that if they were paid for their parental labours， they would earn as muc h as＄172，000 a
year． It looked at the range of jobs mothers do， as well as the hours they are working to determine the figure． This would make their yearly income ￡30，000 more than the Prime Minister earns．
By analysing the numbers， it found the average mother works 119 hours a week， 40 of w hic h would usually be paid at a standard rate and 79 hours as overtime． After questioning 1，000 mothers with children under 18， it found that， on most days， mums started their routine work at 7 am and finished at around 11 pm． To calculate just how much mothers would earn from that labour， it suggested some of the roles that mums could take on， including housekeeper， part-time lawyer， personal trainer and entertainer． Being a part-time lawyer， at ￡48.98 an hour， would prove to be the most profitable of the"mum jobs"， with psychologist（心理学家） a close second．
It also asked mothers about the challenges they face， with 80 percent making emotional demand as the hardest thing about motherhood． Over a third of mums felt they needed more training and around half said they missed going out with friends．



For most mothers， ______ is the biggest challenge．

A. lack of friends
B. low pay for work
C. heavy workload
D. emotional demand

What is the salary of the Prime Minister for a whole year？ ______

A. ￡30，000．
B. ￡142，000
C. ￡172，000．
D. ￡202，000．

What does the underlined word "which" refer to in Paragraph 3？ ______

A. 79 hours．
B. 1，000 mothers．
C. 119 hours．
D. Children under 18．

What is the main idea of this passage？ ______

A. Mothers" working hours should be largely reduced．
B. Mothers should balance their time for work and rest．
C. Mothers" labour is of a higher value than it is realized．
D. Mothers should be freed from housework for social life．