问题 选择题

甲、乙、丙、丁四个小朋友在院里玩球,忽听“砰”的一声,球击中了李大爷家的窗户.李大爷跑出来查看,发现一块窗户玻璃被打裂了.李大爷问:“是谁闯的祸?”

甲说:“是乙不小心闯的祸.”

乙说:“是丙闯的祸.”

丙说:“乙说的不是实话.”

丁说:“反正不是我闯的祸.”

如果这四个小朋友中只有一个人说了实话,请你帮李大爷判断一下,究竟是谁闯的祸(  )

A.甲

B.乙

C.丙

D.丁

答案

本题可分三种情况进行讨论:

①若甲真,则乙假,丙真,丁真;这种情况下,三人说了实话,显然与条件不符;

②若甲假,乙真,则丙假,丁真;这种情况下,两人说了实话,显然与条件不符;

③若甲假,乙假,则丙真,丁假;这种情况下,只有丙说了实话,符合题目给出的条件.

由于丁说了假话,因此闯祸的人一定是丁.

故选D.

单项选择题
单项选择题

阅读下列短文:从每题所给的A、B、C、D四个选项中,选出最佳选项,将正确的选项涂在答题卡上。B

Surviving Hurricane Sandy(飓风桑迪)

Natalie Doan,14, has always felt lucky to live in Rockaway, New York. Living just a few blocks from the beach, Natalie can see the ocean and hear the wave from her house. “It’s the ocean that makes Rockaway so special,” she says.

On October 29, 2012, that ocean turned fierce. That night, Hurricane Sandy attacked the East Coast, and Rockaway was hit especially hard. Fortunately, Natalie’s family escaped to Brooklyn shortly before the city’s bridge closed.

When they returned to Rockaway the next day, they found their neighborhood in ruins. Many of Natalie’s friends had lost their homes and were living far away. All around her, people were suffering, especially the elderly. Natalie’s school was so damaged that she had to temporarily attend a school in Brooklyn.

In the following few days, the men and women helping Rockaway recover inspired Natalie. Volunteers came with carloads of donated clothing and toys. Neighbors devoted their spare time to helping others rebuild. Teenagers climbed dozens of flights of stairs to deliver water and food to elderly people trapped in powerless high-rise buildings.

“My mom tells me that I can’t control what happens to me,” Natalie says. “but I can always choose how I deal with it.”

Natalie’s choice was to help.

She created a website page matching survivors in need with donors who wanted to halp. Natalie posted introduction about a boy named Patrick, who lost his baseball card collecting when his house burned down. Within days, Patrick’s collection was replaced.

In the coming months, her website page helped lots of kids: Christopher, who received a new basketball; Charlie, who got a new keyboard. Natalie also worked with other organizations to bring much-need supplies to Rockaway. Her efforts made her a famous person. Last April, she was invited to the White House and honored as a Hurricane Sandy Champion of Change.

Today, the scars(创痕)of destruction are still seen in Rockaway, but hope is in the air. The streets are clear, and many homes have been rebuilt. “I can’t imagine living anywhere but Rockaway,” Natalie declares. “My neighborhood will be back, even per than before.”

When Natalie returned to Rockaway after the hurricane ,she found().

A.some friends had lost their lives

B.her neighborhood was destroyed

C.her school had moved to Brooklyn

D.the elderly were free from suffering