Marie Curie was born in Poland in 1876．Her parents both taught at school with small salaries．Marie led a hard life as a girl，especially after her mother stopped teaching to raise five children and take care of her poor health．Marie's mother suffered from tuberculosis（肺结核） and died of it when Marie was ten．

When Marie was young，she showed great interest in science．She loved to study and hoped to become a scientist when she grew up．Her parents encouraged her interest in science．Excellent as she was in her studies，she couldn't go on with the advanced education she needed because Poland was then ruled by Russia and women were not permitted to go to college．

In order to continue her education，she overcame many difficulties and entered Paris University，where she lived a simple life and studied hard，so she graduated with the highest grades in her class．

After graduation she took up scientific research in Paris University．There she met Pierre Curie，whom she married later．Pierre joined her in her research into an unknown phenomenon called radiation，which a certain scientist had declared that uranium（铀） gave off．The Curies spen several years trying their best to find the element that produced radiation．Finally they succeeded in 1902．

Marie Curie won two Nobel Prizes，one for physics in 1906，together with her husband and another scientist，the other for chemistry herself in 1911．Madame Curie was a scientist of great achievement，and the first woman ever to be honored in the Nobel Prize history．

21．Why did Marie's family become poorer when she was young？___

A．Because her country was poor．

B．Because her father got small salary as a teacher．

C．Because her mother gave up her job．

D．Because both of her parents were teachers．

22．Marie couldn't continue the advanced education because___．

A．she wanted to help her father to support the family

B．her father couldn't afford to sen