高分子化合物(又称聚合物)其分子量一般在多大范围内()。
参考答案:104~106
The teacher together with the students _______ discussing Reading Skills that _______ newly published in America.
A.are; were
B.is; were
C.are; was
D.is; was
--- There is something wrong with my radio.
--- ____. I can mend it for you.
A.It’s not good for you
B.You’re right
C.Never mind
D.That’s right