Men do not help enough around the house. An American university says it is rare for men to share housework. Researchers looked at working couples who became parents. Men did less than five hours a week housework after their baby was born, even though both parents had jobs. They spent this time helping with the baby.
       Becoming a parent adds 21 hours per week to a mother's work, mostly looking after her baby. New fathers do not do extra work. They do not know the mother is doing more. After a baby is born, men let the women look after the baby. This happens even when the mother is doing the same number of hours in her job.

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1.Which kind of couple researchers looked at?

A All couples.

B Busy couples.

C Unemployed couples.

D Working couples who became parents.

解析：选D。细节理解题。根据第一段第三句Researchers looked at working couples who became parents.可知，故选D。

2.How much time does a man do the housework after their baby was born?

A Less than five hours.

B Less than four hours.

C More than four hours.

D More than twenty-one hours.

解析：选A。细节理解题。根据第一段第四句Men did less than five hours a week housework after their baby was born, even though both parents had jobs.可知，故选A。

3.Why does a mother add 21 hours per week to work?

A Because she retires.

B Because she is a housewife.

C Because she wants to promote.

D Because she has to look after the baby.

解析：选D。细节理解题。根据第二段第一句Becoming a parent adds 21 hours per week to a mother's work, mostly looking after her baby.可知，故选D。

4.Women do______than men when looking after babies.

A all

B less

C more

D nothing

解析：选C。细节理解题。根据第二段第三句They do not know the mother is doing more.可知，故选C。

5.What’s the best title of this passage?

A Parents Are Tired.

B Babies Are Crying.

C Husband Are Lazier.

D Housewives Are Busy.

解析：选C。文章标题题。根据全文可知有了孩子后，丈夫比妻子做更少的家务，故选C。