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问题
选择题
如果（4a
2
b-3ab
2
）÷M=-4a+3b，那么单项式M等于（ ）
A．ab
B．-ab
C．a
D．-b
答案
答案：
B
解答题
一根铁丝长6米，用去
2
3
米，还剩2米．______．（判断对错）
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选择题
Alice _____ her father that both she and her husband would be happy if he would live with them.
A．convinced
B．reinforced
C．pledged
D．required
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