An international treaty signed several years ago （ ）trade in plants and animals of endangered species.

A.bans B.eliminates C.promotes D.protects

After a few short but interminable seconds, U. S. Astronaut Neil Armstrong placed his foot firmly on the fine-grained surface of the moon. The time was 10： 56 pm, July 20, 1969.

Every month ¥3 is （ ）from our salary for house repairing payment.

This river is so wide that it is impossible to build a （ ）under it without modem technology.

In North Dakota, which had barely an inch of rain in four months,there was no grass for cattle. Farmers tramped their dusty fields,watching their dwarfed stand of grain shrivel and（ ）.

（ ）it is generally agreed that sex-role stereotyping contributes to narrowly defined expectations about human potential, limited career options for males and females, and mixed messages about the world which contradict daily life experience, the social costs of such stereotyping have not been fully explored in the educational arena.