“Why are you unwilling to accept this opportunity in space? Have you read the{#blank#}1{#/blank#}(describe) carefully?” Wang Ping asked me. “You will live in a {#blank#}2{#/blank#}(furnish) house with all modem equipment and robots will be able to clarify any problems. You are only needed to become familiar with the administration and rules for such a project. It will be an{#blank#}3{#/blank#} (enjoy) experience for you.”

    Many people need to be reminded of the job opportunities in space stations, which{#blank#}4{#/blank#} (constant) need space cooks, cleaners, teachers, stewards and stewardesses. You can be swiftly trained for your new job from using previous skills. At first people may find new surroundings difficult{#blank#}5{#/blank#}(tolerate). However, they will be able to overcome the difficulties if their families encourage them to take{#blank#}6{#/blank#} the job. There are lots of advantages{#blank#}7{#/blank#}come from a period of time in space. But for health reasons only one stay of three years{#blank#}8{#/blank#}(allow), because{#blank#}9{#/blank#}link between illness and length of stay may be strong. It is a little disappointing,{#blank#}10{#/blank#}the rules cannot be changed for anyone.

    The way we cook is important. In many countries, the two choices are {#blank#}1{#/blank#}(nature) gas or electric ­powered stoves.

    The World Health Organization warns that millions of people {#blank#}2{#/blank#}(suffer) from indoor air pollution at present time, which results from the use of {#blank#}3{#/blank#}(danger) fuels and cook­ stoves in the home.

    WHO officials say nearly three billion people are {#blank#}4{#/blank#}(able) to use clean fuels and technologies for cooking, heating and lighting. As a result, more than seven million people die from exposure to indoor or outdoor air pollution each year. Most of the deaths are in {#blank#}5{#/blank#}(develop) countries, such as India, China and Latin American countries.

    WHO officials say opening a window or door {#blank#}6{#/blank#}(let) out the harmful air will not correct the situation. {#blank#}7{#/blank#}will only pollute the outdoors.

    Nigel Bruce, {#blank#}8{#/blank#} is a professor of Public Health at the University of Liverpool, says researchers are developing good cook­stoves and other equipment to burn fuels {#blank#}9{#/blank#} a more efficient way.

    But, this is just a start. It is urging developing countries to use {#blank#}10{#/blank#}(clean) fuels and increase access to cleaner and more modern cooking and heating appliances (用具).

    Each year thousands of{#blank#}1{#/blank#} (explore) and tourists visit the polar regions of the Arctic and Antarctica. But the increasing number of people travelling to the ends of the Earth' can have a negative effect{#blank#}2{#/blank#} fragile ecosystems. Should tourists{#blank#}3{#/blank#}(allow) to visit polar regions?

    About 40,000 tourists visit Antarctica each year, More than five million travel to the Arctic and sub-Arctic. Transporting tourists to the regions {#blank#}4{#/blank#}(increase) ship and airplane traffic, adding to the risk of pollution, oil spills, and other {#blank#}5{#/blank#}(environment) damage. Because the places where wildlife is accessible {#blank#}6{#/blank#}(be) few in numbers, tourist traffic can become concentrated in specific areas,{#blank#}7{#/blank#} (put) Arctic vegetation at risk.

    Others say that access{#blank#}8{#/blank#} these very special parts of the world should not be restricted to only researches and scientist. Polar tourism allows people to develop deep personal connections with polar regions. “Those {#blank#}9{#/blank#}travel to the Arctic or Antarctica often become cheer leaders for supporting those places” Jim Sano, vice president for travel and{#blank#}10{#/blank#}(conserve) at World Wildlife Fund, told TFK.