问题 选择题

下列说法正确的是(  )

A.地震会产生次声波

B.电磁波中只有无线电波能够传递信息

C.验钞机是利用超声波来辨别人民币的真伪

D.紫外线可用来对人体进行长时间照射消毒

答案

A、地震时,由于地壳、岩石的振动会产生次生波,A是正确的;

B、除了无线电波之外,还有微波、红外线、紫外线、可见光等都属于电磁波,都能够传递信息,故B错误;

C、紫外线可以使荧光物质发光,验钞机能发出紫外线,可以使钞票上的荧火物质发光,以鉴别真伪,故C错误;

D、长时间接受紫外线照射可以使皮肤粗糙,甚至引起皮肤癌,故D错误.

故选A.

阅读理解

The Florida Sea Base Programs

Diving Adventure

If you are a diver, this is your program. During the program you will be making as many as nine dives (weather permitting), including a night dive. We have open dates in June, July and August for the summer months and for fall we have opening in September, October, November and December. Check out the dates today. Click here!

Sea Exploring!

The name brings back the memory of pirates(海盗) sailing the high seas of the past. This adventure is for larger teams of 18 to 20 teammates. Sailing on a tall ship with your team, you will be making memories that you will share for the rest of your life with anyone who will listen. Be sure and check out the dates we have open. Click here! We can fit your timetable to meet your needs with these great dates.

Live Aboard Diving

The Florida Sea Base has the sailing and diving programs joined for one wonderful adventure! On this adventure, you will spend your days not only in diving, but also in sailing around the Florida Keys. There are openings this fall and winter. Check now for open dates to spend your winter holidays in the keys. Click here! Fall dates are open now. Check them out today!

Just around the corner: the Christmas season in the keys! We have an opening for the Live Aboard program on December 26. Book today---it won’t last long!

Diving Certification(证书)

The Diving Certification program is designed for teammates who want to get a certification--- all who complete the week successfully will be offered PADI certification! Come and learn how to dive in the beautiful waters of the Florida Keys.

We have the following dates open: August 5, August 12, August 19, August 22 and August 26. We also have programs we offer in the fall: September 30, October 7, October 14, October 21, and many more dates. Check out the rest of the dates. Click here!

55. The text is most probably found _________.

A. in a newspaper            B. on the Internet

C. in a science magazine       D. in a book about Florida Sea

56. Colin wants to join in the Diving Adventure. He is supposed to have ______.

A. 9 dives                 B. 10 dives       

C. 19 dives                D. as many dives as he likes

57. According to this text, Live-Aboard Diving is special in that ____.

A. diving goes on during the sailing   

B. it is an adventure at sea

C. there are diving programs in it     

D. it is held in the Christmas season

58. The purpose of the text is mainly to ________.

A. teach        B. introduce       C. report       D. advertise

单项选择题 B1型题