题目内容

8. I'm feeling sick. I ____________ so much chocolate.

A. can't have eaten
B. needn't have eaten
C. shouldn't have eaten
D. won'thave eaten

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9. The price on this packet is wrong. It says $65 but it ___________ $50.

A. canbe
B. will be
C. shall be
D. shouldbe

10. He says he's 21 but he __________ older than 18.

A. need not be
B. shall not be
C. darenot be
D. can't be

按照抗拉强度由高到低将下列材料排序。

选出全是促进石墨化的元素的一组（）

A. Mg、B、Cu
B. V、Cr、S
C. W、Mn、P
D. Al、Ni、Si