冠词填空。

1. His father, who is ______ honest man, is teaching in ______ university.

2. Which is heavier, ______ elephant or ______ horse?

3. ______ cold wind was blowing from the north.

4. He is always ready to help ______ old and ______ young.

5. ______ Greens are traveling in ______ South China.

熔融塑料是在高压下注射入模腔的，虽然流经料筒、喷嘴和模具的浇道后有部分压力损失，但仍具有相当大的压力，该压力称为（）。

A、锁模力

B、注射压力

C、模腔压力

D、背压