小题1:Which of the following books is the latest in print?

A．Harry Potter and the Deathly Hallows.

B．Deceptively Delicious.

C．Rich Dad ,Poor Dad.

D．The Road .小题2:Among the books, there is/are ____ written for adults.

A．one

B．two

C． three

D．four小题3:Who wrote Rich Dad, Poor Dad?

A．J.K. Rowling.

B．Jessica Seinfeld.

C．Cormac McCarthy.

D．Robert T. Kiyosaki.小题4:If you buy two copies of The Road and one copy of Deceptively Delicious, you should pay_______.

A．$23.83

B．$18.33

C．$12.83

D．$11小题5:We can learned from the form（图表） that ____.

A．Deceptively Delicious and The Road came out on the same day

B．J .K Rowling ’s book is the most expensive among the four books

C．The Road is the thinnest of the four

D．Rich Dad, Poor Dad is hardcover

井下在什么情况下使用自救器？简述操作方法？