A：q
B：b
C：p
D：d
现榨的苹果汁在空气中会由淡绿色变为棕黄色。你猜测其原因可能是( )
46＋37=____
2−5的相反数是____．
— People can find _____ useful information on the Internet.
— Yes. It's important ____ to use computers.
