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解析：Most people who travel lon

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【单选题】

Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone {{U}} (21) {{/U}}making mistakes. It is actually caused by {{U}} (22) {{/U}} of your "body clock" --a small cluster of brain cells that controls the timing of biological {{U}} (23) {{/U}}. The body clock is designed for a {{U}} (24) {{/U}}rhythm of daylight and darkness, so that it is thrown out of balance when it {{U}} (25) {{/U}} daylight and darkness at the "wrong" times in a new time zone. The {{U}} (26) {{/U}} of jetlag often persist for days {{U}} (27) {{/U}} the internal body clock slowly adjusts to the new time zone.
Now a new anti-jetlag system is {{U}} (28) {{/U}} that is based on proven {{U}} (29) {{/U}} pioneering scientific research.Dr, Martin Mooreede had {{U}} (30) {{/U}} a practical strategy to adjust the body clock much sooner to the new time zone {{U}} (31) {{/U}}controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates {{U}} (32) {{/U}} of the discomfort of jetlag.
A、successful time zone shift depends on knowing the exact times to either {{U}} (33) {{/U}} or avoid bright light.Exposure to light at the wrong time can actually make jetlag worse. The proper schedule {{U}} (34) {{/U}} light exposure depends a great deal on {{U}} (35) {{/U}} travel plans.
A．extensive
B．tentative
C．broad
D．inclusive

网考网参考答案：B
网考网解析：
[解析] C项broad意为“宽阔的，概括的”；D项inclusive意为“包括的”，用来修饰pioneering scientific research显然都不合适，所以可以排除C项和D项。A项extensive意为“广泛的，大量的”，显然和文中所给出的pioneering“前卫的，创新的”不符合。因此只有B项tentative“试探的，实验性的”和上下文最贴切。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>

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