小题1:What do people want to do at Nancy’s Gym?

A．To enjoy swimming.

B．To learn skating.

C．To become thinner.

D．To become fatter小题2: Lucy likes skating. Which ad is she probably interested in?

A．Ice World.

B．Water World.

C．Nancy’s Gym.

D．Restaurant小题3:Which costs the most for an adult?

A．Keeping fit at Nancy’s Gym.

B．Skating in Ice World.

C．Swimming in Water World.

D．Losing weight at Nancy’s Gym

X、R表示两种金属，在溶液中发生反应：X+3RNO₃=3R+X（NO3）₃。下列说法不正确的是

A．该反应是置换反应

B．若X是Al，R是Ag，则反应后溶液质量减少

C．X可能是Fe，R可能是Cu

D．X的金属活动性比R强