By comparison, the existing American test of history and civics knowledge seems fairly robust.

Reports from all the Latin American tests indicate that the vaccine is safe for human use.

American tests now being drawn up also try to combine several purposes.

A prologue showing footage of American nuclear tests was added.

But last year, the Russians said they would have to resume their own program after the first American test of 1987, which has now occurred.

An American test could have been used and would have averted the tragedy, they claimed.

Americans say they do not want that kind of test, leading to questions about what an American national test should be.

But an American test should be used to find and help those children who are not doing well, backers of the idea argue.

There is no convincing rationale for new American tests.

Frequent American tests undercut our attempts to stop the spread of nuclear weapons.