题目内容

Why would Rowena encourage more people to learn first aid?

A. You never know when you might need it.
B. It looks good on your
C. It’s interesting.

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Choose the correct words to complete the sentences.1. I was sitting at home when (suddenly / sudden) the telephone rang.2. Greg is ill today, but (hopefully / hopeful) he’ll feel better tomorrow.3. (Unfortunately / Fortunately) I can speak French, so traveling around Paris isn’t a problem for me.4. Her mother made a (remarkably / remarkable) recovery.5. I really think we should (encourage / courage) more young people to do volunteer work.6. Health insurance will be our top (prior / priority).

若用8位0，1表示一个二进制数，其中1位即最高位为符号位，其余7位为数值位。十进制数15的原码、反码和补码表示，正确的是_____。

A. 10001111，11110000，11110001
B. 00001111，00001111，00001111
C. 00001111，01110000，01110001
D. 00001111，01110001，01110000

若用8位0，1表示一个二进制数，其中1位即最高位为符号位，其余7位为数值位。十进制数（-18）的原码、反码和补码表示，正确的是_____。

A. 10010010，11101101，11101110
B. 10010010，01101101，01101110
C. 10010010，11101110，11101101
D. 00010010，01101101，01101110

在淘宝网上开设网店至少发布（）件商品才能开店。

A. 5
B. 8
C. 10
D. 12