问题 选择题

下列说法错误的是(  )

A.y=x4+x2是偶函数

B.偶函数的图象关于y轴对称

C.y=x3+x2是奇函数

D.奇函数的图象关于原点对称

答案

偶函数的定义是满足f(-x)=f(x);奇函数的定义是f(-x)=-f(x)

奇函数的图象关于原点对称,偶函数的图象关于y轴对称

所以B,D是正确的

对于A将x换为-x函数解析式不变,A是正确的

故选C

阅读理解

 

C

A man from Sri Lanka on Friday broke the Guinness world record for the longest time spent watching TV. He finished with 69 hours and 48 minutes.

Suresh Joachim did his TV viewing in the lobby (门厅) of WABC-TV as part of the “Guinness World Record Breaker Week ” on the TV talk show “Live With Regis and Kelly”.

After passing the previous record of 50 hours and 7 minutes Thursday, Joachim continued until about 7 am Friday.

Sitting on a brown leather couch, he watched nothing but ABC shows.

“I’m going to be a little tired of watching TV after this,” Joachim told reporters by phone during a brief break.

Rules of Guinness for the couch potato honor, allow for a five-minute break every hour and a 15-minute break every eight hours. The viewer must be constantly looking at the screen.

The hardest part, Joachim said on Live With Regis and Kelly, was “I couldn’t watch the people” — the many waving passers-by on the street outside the ABC studio.

Joachim, who lives in Toronto but comes from Sri Lanka, now holds more than 16 Guinness records, including the longest duration (持续) balancing on one foot (76 hours, 40 minutes) and bowling for 100 hours. He does it, he says, to raise awareness of suffering children.

64. Which paragraph shows the main idea of the passage?

A. The first paragraph.                                B. The last paragraph.

C. The second paragraph.                            D. The sixth paragraph.

65. How long had Joachim spent when the new “couch potato” record was made?

A. Half a week.                                   B. Less than two days.

C. 76 hours, 40 minutes.                             D. Nearly three days.

66. Which of the following phrases can replace the underlined word “constantly”?

A. All the time.  B. At times.  C. Some time.   D. Once upon a time.

67. What’s the biggest pity for Joachim when he did his TV viewing?

A. That Joachim could eat nothing.

B. That Joachim couldn’t watch the people outside.

C. That Joachim felt very tired.   

D. That Joachim didn’t have any time for a break.

单项选择题