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问题 单项选择题

有一个深度为4的满二叉树，下面关于序号为7的结点的叙述中正确的是( )。

A．该结点双亲的序号为4
B．该结点处于二叉树的第4层
C．该结点没有右子树
D．该结点左子树根结点的序号为14

答案

参考答案：D

单项选择题

Questions from 36 to 40 are based on the following passage:

　　Against this background, the WTO faces several daunting challenges. The first is to continue bringing down tariffs on traded goods. Average penalties have fallen steadily since the GATT’s formation but even the most open economies retain lofty barriers: for instance, America still charges a tariff of 14.6% on import of clothing, five times higher than its average levy.

　　Resistance to tariff cuts is pest in agriculture. According to Tim Josling, a trade expert at Stanford University, tariffs and other barriers on farm goods average a crippling 40% worldwide and create distortions that “destroy huge amounts of value”. A new set of global farm talk is planned to start in 1999. At the least, you might think, these could lock in impressive reforms in Latin America and encourage further watering-down of the European Union’s Common Agricultural Policy. But they will prove difficult: squabbles over agriculture almost sank the Uruguay round.

What does the WTO face?（）

A．fair trade rules.

B．free trade

C．export tax reduction.

D．several challenges.
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单项选择题 A3/A4型题

患者，女性，32岁。主诉外阴奇痒难忍2天。妇科检查： * * 豆渣样白色膜状物，擦拭后露出红肿黏膜。

行 * * 灌洗时，首选溶液为（）

A.1%乳酸

B.2%～4%碳酸氢钠

C.0.2%新洁尔灭

D.1：5000高锰酸钾

E.生理盐水
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