A 23-year-old woman who didn't know she was pregnant gave birth on an Air Canada flight to Japan. The new mom, Ada Guan, gave birth to a full-term baby girl named Chloe on Sunday, somewhere over the Pacific Ocean. The mother and baby landed in Tokyo "safe and sound."

Guan's boyfriend, Wesley Branch, said they had no idea they were about to become parents. He said Guan had got some weight but took a pregnancy test and it showed she was not pregnant. He also said she saw a doctor just a few weeks ago who didn't find out the pregnancy. The baby was born with the help of a doctor among the passengers.

Although it may seem impossible for a woman to go through nearly nine months of pregnancy without knowing a baby's on the way, it actually happens. A British study found that one in 2,500 pregnancies is a surprise until babies are born.

In January, a Massachusetts woman, Katie Kropas, gave birth to a 10-pound baby girl without realizing she was pregnant until she went into labor. "I thought I had put on some Christmas season weight, but I never thought I was pregnant. Never," Kropas said.

"Very often, especially in your first pregnancy, you're really not aware of what you're feeling," said Dr. Kim Dever. She said the hospital sees a few such cases each year.

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1.Where did the woman give birth to her daughter?

A In the hospital.

B At her home.

C On a train.

D On a plane.

解析：选D。D 细节理解题。根据第1段第1句A 23-year-old woman who didn't know she was pregnant gave birth on an Air Canada flight to Japan.可知，故选D。

2.When did the woman know she was pregnant?

A Several months ago.

B When she gave birth to her baby on the plane.

C After she took a pregnancy test.

D A few weeks ago.

解析：选B。B 内容理解题。根据第1段与第2段内容可知，故选B。

3.“a surprise” in paragraph 3 refers to_____.

A Giving birth to a baby on a plane.

B Doctors tell them they are pregnant.

C So many women don’t know they are not pregnant.

D Giving birth to a baby without know they are pregnant.

解析：选D。D 内容理解题。根据第3段内容可知此处surprise指的是足月生产却不知道自己怀孕，故选D。

4.What is the most possible explanation for an unknown pregnancy?

A Putting up weight.

B Sleeping.

C No pregnant experience.

D Busy.

解析：选A。A 内容理解题。根据第2段He said Guan had got some weight与第4段"I thought I had put on some Christmas season weight,可知，故选A。

5.Which statement is RIGHT according to the passage?

A The woman gave birth to her baby on the way to Cananda.

B A doctor helped the woman take a pregnancy test and told her not to take a plane.

C A sudden birth usually happens in the first pregnancy.

D Guan was the only woman that gave birth to a baby on a plane.

解析：选C。C 内容理解题。根据最后一段第1句"Very often, especially in your first pregnancy, you're really not aware of what you're feeling," said Dr.可知，故选C。