Most people, when they travel to space, would like to stay in orbit for a few days of more. And this stands to reason, if you' re paying $20,000 for your trip to orbit! Strain order for tourism to reach its full potential there' s going to be a need for orbital accommodation--or space hotels. What would a space hotel actually be like to visit? Hotels in orbit will offer the services you expect from a hotel--private rooms, meals, bars. But they' ll also offer two unique experiences: impressive views--of Earth and space--and the endless entertainment of living in zero gravity--including sports and other activities that make use of this. The hotels themselves will vary greatly--from being quite simple in the early days to huge luxury structure at a later date. It s actually surprising that as later as 1997, very few designs for space hotels were published. This is mainly because those who might be expected to design them haven' t expected launch costs to come down far enough to make them possible. Lots of people who' ve been to space have described vividly what it' s like to live in zero gravity. There are obviously all sort of possibilities for dancing, gymnastics, and zero-G sports. Luckily, you don' t need to sleep much living in zero gravity, so you' ll have plenty of time for relaxing by hanging out in a bar with a window looking down at the turning Earth below. Of course all good things have come to an end. Unfortunately, and so after a few days you' ll find yourself heading back enough you' ll be much more expert at exercising in zero gravity than you were when you arrived. You' ll be thinking how soon you can save up enough to get back up again--or maybe you should change jobs to get to work in an orbiting hotel. What is the main idea of the stext? A) Traveling in space. B) The ways of living in space hotels. C) Zero gravity and space hotels. D) The description of space hotels.
D
Nicaragua's Cerro Negro Volcano has erupted 23 times in the past 100 years,burying homes, crops and people in lava and ashes. But recently the black mountain has become a tourist draw, thanks to a newly invented extreme sport: volcano boarding. Thousands of thrill-seekers have climbed to the top of Cerro Negro, peered into its mouth, then zipped down its rough-and--rocky 41--degree slope on special boards. The volcano-boarding speed, set by an Israeli woman, is 54 mph. "Rushing down an active volcano is something that people expect." Said Anthony Alcalde, an expert volcano boarder. The sport was developed in the mid-2000s by Darryn Webb, an Australian who had climbed the nearby Cerro Negro but was looking for a faster way to get to the bottom. He tried sliding down on surfboards, snowboards, and even a refrgerrator door before inventing a sit-down board made of plywood. "At first, Darryn planned to use a snowboard," said Gemma Cope, a British woman who now runs Big Foot, which offers volcano boarding tours. "But he realized he couldn't cut an edge for there were little rocks everywhere. So he came up with the sitting-down option and realized he can go pretty fast. " Tourists,who are nearly all foreigners,pay $28 for the experience, which begins with a truck ride on dirt roads to Cerro Negr0.a 2,400-foot--high volcano that last erupted in l999.Visitors must carry their boards during the half-hour climb to the top. There,they go straight down the slope and sometimes they have to use their feet for brakes.Along the way.The board fills with rocks and dust,making boarders almost blind.Crashes are common."l wiped out twice and ripped my pants."said Melinda Vorisek, a tourist from Miami."But I'd do it again." Another tourist added:"It was sheer terror. I was eating dirt.But how many people can say they've bombed down a volcano?" What is Gemma Cope according to the passage? A) A lifeguard on Cerro Negro. B) The inventor of the special board. C) A Judge of the volcano boarding sport. D) The manager of an tourist company.
D
*Question*
Trees should only be pruned when there is a good and clear reason for doing so and , he number of such reasons is small . Pruning involves the cutting away of overgrown and unwanted branches , and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way . First , pruning may be done to make sure that trees have desired shape or size . The object may be to get a tree of the right height , and at the same time to help the growth of small side branches , which will thicken its appearance or give it a special shape . Secondly , pruning may be done to make the tree healthier . You may cut out diseased or dead wood , or branches that are rubbing against each other and thus cause wounds . The health of a tree may be encouraged by removing branches that are blocking up the center and so preventing the free movement of air . One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease , but it is a wound that will heal . Often there is a race between the healing and the disease as to whether the tree will live or die , so that there is a period when the tree is at risk . It should be the aim of every gardener to reduce that risk of death as far as possible . It is important to make the area , which has been pruned , smooth and clean , for healing will be slowed down by roughness . You should allow the cut surface to dry for a few hours and then paint it with one of the materials available from garden shops produced especially for this purpose . Pruning is usually done in winter , for then you can see the shape of the tree clearly without interference from the leaves and also it is very unlikely that the cuts you make will bleed . If this does happen , it is , of course , impossible to paint them properly . Trees become unhealthy if the gardener_. A) To help a wound to dry . B) To cover a rough surface . C) damages some of the small side branches D) Allows too many branches to grow in the middle
**Answer**
D