Although they earn considerable revenue(收入) by attracting tourists, they take up land which is increasingly sought by the local people.

A．beautiful
B．unlimited
C．limited
D．natural

A．children have to go to different schools because of their parents’ moving around
B．children make slow progress because they are mentally affected
C．signs are shown that many children are mentally affected by their studies
D．changing from one school to another too often has ill effect on children’s studies