单选题 Directions:
Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET.
It sounds like a real-life version of Lost: a 272-ton Boeing 777 {{U}} {{U}} 1 {{/U}} {{/U}}from Kuala Lumpur International Airport and {{U}} {{U}} 2 {{/U}} {{/U}}less than an hour into a flight to Beijing, disappearing from air-craft radar screens and triggering a massive search {{U}} {{U}} 3 {{/U}} {{/U}}high-tech warships, nimble supersonic jets, all-seeing satellites—the combined technological resources of 26 countries. Days {{U}} {{U}} 4 {{/U}} {{/U}}without a trace of the airliner. Big Brother looks high and low—and finds {{U}} {{U}} 5 {{/U}} {{/U}}.
The world lost {{U}} {{U}} 6 {{/U}} {{/U}}with Malaysia Airlines Flight 370 in the early hours of March 8, somewhere in no-man's-sky {{U}} {{U}} 7 {{/U}} {{/U}}Malaysia and Vietnam. Every day that followed brought new theories of what might have happened as dark turned to dawn. Was the plane hijacked to some remote landing strip and, if so, where are the passengers? {{U}} {{U}} 8 {{/U}} {{/U}}had the jet malfunctioned and {{U}} {{U}} 9 {{/U}} {{/U}}into the ocean-and if so, where was the debris? As search team looked for answers to these questions, the millions of people worldwide who were {{U}} {{U}} 10 {{/U}} {{/U}}for updates about MH370 were left wondering how, in 2014, technology could come up so short, {{U}} {{U}} 11 {{/U}} {{/U}}a 209-ft. (64m) airliner carrying 239 people to {{U}} {{U}} 12 {{/U}} {{/U}}for the longest period of time in modern commercial aviation history.
The {{U}} {{U}} 13 {{/U}} {{/U}}story of MH370 doesn't fit into the narrative of our omniscient (无所不知的) era. The world's intelligence agencies can watch and {{U}} {{U}} 14 {{/U}} {{/U}}to millions of us as we go about our lives. {{U}} {{U}} 15 {{/U}} {{/U}}we nonspies have plenty of tracking technology at our disposal. Pull up a web browser and with a few keystrokes we can {{U}} {{U}} 16 {{/U}} {{/U}}our lost iPhones, track satellites as they circle the earth, use Google Maps to explore far-off lands. How, then, with our {{U}} {{U}} 17 {{/U}} {{/U}}infrastructure of bits and bytes, did we fail to {{U}} {{U}} 18 {{/U}} {{/U}}a jumbo jet?
The answers are disturbing. For all the post-9/11 security protocols we submit to every time we get on a plane, much of the basic {{U}} {{U}} 19 {{/U}} {{/U}}that is meant to track our progress through the sky is full of holes. And even our most modern {{U}} {{U}} 20 {{/U}} {{/U}}can be rendered invisible by the human hand.