练习：
A He says there is emerging evidence that children absorb low-level radiation at a rate more than three times that of adults6.
B By the year 20004 it is estimated that Australia will have 8 million mobile phones ：nearly one for every two people.
C "If mobile phones are found to be dangerous,they should carry a warning label until proper shields can be devised,"he said.
D Then who finances the research?
E For example,Telstra,Optus and Vodaphone build their towers where it is geographically suitable to them and disregard the need of the community.
F The conclusion is that mobile phones brings more harm than benefit.
答案与题解：
1.C"空1”应该填入与low-level radiation有关的内容，例如：low-level radiation究竟有害还是无害。所以，C是合适的选项。此外,直接引语也佐证了选择的合理性。
2.B"空2”前面一句介绍了澳大利亚拥有手机的现状。选项B的内容是对到2000年之前手机发展前景的预测，内容连贯，是正确答案。
3.E这一段第一句说的是，许多微波发射塔建在人口稠密的居民区。选项E的内容涉及微、波发射塔的地点选择只考虑到地理位置，而不顾及社区的安全。选项E扩展了第一句表达的信息。此外，选项E中出现tower这个词，与第一句的tower相呼应，也佐证了选择的合理性。
4.A"空4”前面一句说的是Robert Bell建议政府应该禁止在儿童比例高的地区(如学校操场、儿童医疗中心、居住小区等)的500米半径范围内建造发射塔。选项A说明为什么要这样做的原因，因而是答案。
5.D"空5”后面一句说的是major telephone companies出钱资助研究项目的问题，提示了D是正确答案。