关于油脂性基质的错误表述为A．油脂性基质包括烃类、类脂类、油脂类三类B．凡士林基质适用于有大量渗

The role of the _____ can be invaluable in problem solving.

A recognition seeker

B devils advocate

C dominator

D topic jumper

E A or C

56 The role of the _____ can be invaluable in problem solving.

A. recognition seeker

B. devils advocate

C. dominator

D. topic jumper

E. A or C

Why was Dr. Boy's idea unpopular？

A．He argues for the role of school in solving social problems.

B．He supports the current school calendar.

C．He thinks that school year and family life should be considered separately.

D．He strongly believes in the educational role of school.

A. A role can be given to a maximum of 1000 users.

B. A user can have access to a maximum of 10 roles.

C. A role can have a maximum of 100 privileges contained in it.

D. Privileges are given to a role by using the CREATE ROLE statement.

E. A role is a named group of related privileges that can be granted to the user.

F. A user can have access to several roles, and several users can be assigned the same role.

That job is quite diffcuh．I can understand why you have so many prob lems．

A．Because they can help set good role models.

B．Because they can stop white-collar crime.

C．Because they can reduce crime.

D．Because they can make criminals feel fair.

[b] in debate and [1] in delate can be said to form. a(n) _____.

A．phonemic contrast

B．complementary distribution

C．assimilation role

D．sequential role

A．Firefighters play an important role in America.

B．Kids should learn not to be afraid of monsters.

C．Carelessness can result in tragedies.

D．Informative speeches can save lives.