设N_A为阿伏加德罗常数的数值，下列说法正确的是（   ）

给加线字选择正确的拼音。    

挑战（tiāo tiǎo）____      扔掉（rēng rēn）____     轰炸（zhà  zà)____

扇动（shàn shān）____      清澈（cè chè）____        散裂（sàn sǎn）____  

    There are ten books about English. They are on Shelf D. There are seven books about music. They are on Shelf B. There are nine books about computers. They are on Shelf C. There are five books about art. They are on Shelf A.

⑴Books about English____       A. nine      a. Shelf A

⑵Books about music____        B. seven     b. Shelf B

⑶Books about computers____   C. five       c. Shelf C

⑷Books about art____           D. ten       d. Shelf D