根据研究者对访谈结构的控制程度，可分为（）。

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. Microwave communication uses(66)-frequency radio waves that travel in straightline sthrough the air. Because the waves cannot(67)with the curvature of the earth, they can be(68)only over short distance. Thus, microwave is a good(69)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of' dishes' or(70). These can be installed on towers, highbuildings, and mountain tops.A．highB．lowC．longD．short

A.
B.
A．high
B．low
C．long
D．short

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社会工作者面临的几种主要伦理困境是指（）。

A．保守秘密
B．案主自决与家长作风
C．职业界限与个人利益之间的冲突
D．职业价值与个人价值之间的矛盾
E．资源分配时面临的伦理困境

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