Despite increased airport security since September 11th, 2001, the technology to scan both passengers and baggage for weapons and bombs remains largely unchanged. Travellers walk through metal detectors and carry-on bags pass through x-ray machines that superimpose colour-coded highlights, but do little else. Checked-in luggage is screened by "computed tomography", which peers inside a suitcase rather like a CAT scan of a brain. These systems can alert an operator to something suspicious, but they cannot tell what it is.
More sophisticated screening technologies are emerging, albeit slowly. There are three main approaches: enhanced x-rays to spot hidden objects, sensor technology to sniff dangerous chemicals, and radio frequencies that can identify liquids and solids. A number of manufacturers are using "reflective" or "backscatter" x-rays that can be calibrated to see objects through clothing. They can spot things that a metal detector may n
A. unreliable screening
B. full exposure
C. inadequate efficiency
D. travellers’ modesty
Despite increased airport security since September 11th, 2001, the technology to scan both passengers and baggage for weapons and bombs remains largely unchanged. Travellers walk through metal detectors and carry-on bags pass through x-ray machines that superimpose colour-coded highlights, but do little else. Checked-in luggage is screened by "computed tomography", which peers inside a suitcase rather like a CAT scan of a brain. These systems can alert an operator to something suspicious, but they cannot tell what it is.
More sophisticated screening technologies are emerging, albeit slowly. There are three main approaches: enhanced x-rays to spot hidden objects, sensor technology to sniff dangerous chemicals, and radio frequencies that can identify liquids and solids. A number of manufacturers are using "reflective" or "backscatter" x-rays that can be calibrated to see objects through clothing. They can spot things that a metal detector may n
A. A generalization is made in paragraph 2 and then elaborated in paragraph 3,4 and 5.
B. More sophisticated screening technologies are mentioned in paragraph 2 and 3 and then examples are provided in paragraph 4 and 5.
C. Specific evidence is provided in paragraph 1,2 and 3 and then a conclusion is drawn in paragraph 4.
D. Three main approaches are advanced in paragraph 2,3 and then their functions are detailed in paragraph 4 and 5.
| Despite efforts to provide them with
alternatives such as the shelter, women frequently and repeatedly returned to
violent and abusive partners. By the late 1970s, feminists at Women Together,
like those doing similar work throughout the United States, began to understand
that battered women experience a range of post-traumatic psychological responses
to abuse, similar to those of victims of other types of violence or trauma.
Subsequently, the psychological response of battered women became reified as
"battered woman syndrome," a sub-category of post-traumatic stress disorder.
Interestingly, in the course of trying to create social change, the focus of
feminists perceptibly shifted to trying to explain why battered women fail to
leave the partners who beat them. In trying to address this question, a debate
ensued among feminists a A. refers to the bird that Americans eat at Thanksgiving. B. is an unflattering reference to other law-makers. C. is an unflattering reference to the speaker herself. D. will be explained in the following paragraph. E. refers to none of the above. 我来回答: 提交
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