---What did your granddaughter say just now?

--- She wondered ___________.

A．what time was it

B．whether the book was written by Mark Twain

C．how could she use the MP4

D．when she will have a final test

要使小华家的电热淋浴器水箱内储有的质量为30kg的水，温度由20℃升高到35℃时，需要吸收的热量是多少焦？[c_水＝4.2×10³J/（kg·℃）]