A：quickly
B：quick
C：slow
You can have a good view of Nanjing at the top of Zijin Mountain ______ a clear day.
13–8 =____ 17–3 =____22+5 =____60+23 –3=____
43+ 20=____7+60=____68– 6=____88– 50+30 =____
88–7 =____ 6+9 =____13－9=____75–60+70=____
90–20= ____ 50+48 =____ 74–40 =____78–8–30 =____
49+ 40=____15–8=____ 30+60 =____32+50–40 =____
下列说法正确的有 （ ）①任何实数的平方根有两个，且它们互为相反数 ②无理数就是带根号的数③数轴上所有的点都表示实数 ④负数没有立方根
