患者男性，62岁，活动时心前区疼痛2年余。1个月来患者发作次数增多，3～5次／天，休息状态下亦能发作，持续15分钟以上缓解。首先考虑的诊断为（）。
A.变异型心绞痛
B.稳定性心绞痛
C.不稳定性心绞痛
D.初发劳力性心绞痛
E.心脏神经症
参考答案：C
解析：患者典型劳力性心绞痛病史2年余，1个月来心绞痛症状发作频繁，休息时亦能发作，时间大于15分钟，符合不稳定性心绞痛的诊断，故首先考虑。
| 阅读理解。 |
| How much ancient forest (原始森林) do you have in your home? Are you sleeping on illegal trees-trees from the Congo? Is your kitchen table made from wood, which has started social conflict in a distant African country? Are you literally flushing an ancient forest down the toilet? Check out our interactive Forest House to see exactly where your household goods come from and the forest-friendly alternatives. The Earth's ancient forests are unique, centuries old regions that support countless plant and animal species as well as native communities. But they are rapidly vanishing (消失) as the demand for wood and paper grows. In fact, only 20 percent of the world's ancient forests remain-a very scary statistic. Our comfy houses are contributing to the problem-in Europe, 50 percent of the tropical wood used in our furniture, doors and window frames is logged illegally, often from irresponsibly managed ancient forests. This wood often fuels corruption and social conflict and destroys the homes of endangered or undiscovered species. Our interactive Forest House is a room-by-room (and garden) guide to wood in household products, featuring everything from flowerboxes to guitars. You can also learn exactly why wood is "good" or "bad" and print out our one-pager to stick on the fridge and check before you make that trip to IKEA. The Forest House also lets you search by product, so if you're on the lookout for a new hat stand or toilet seat, you'll know you should give teak a miss. In general, the safest wood is always Forest Stewardship Council (FSC) certified. This means that the wood is from a sustainable (可持续的) managed forest and that the rights of indigenous peoples are respected during the logging process. Some homeware stores such as IKEA and Home Depot (in the US) have made commitments to only source FSC certified wood for their products. |
1. Write out some wood products in your home.   |
| (1) (2) (3) (4) |
| 2. Only _______ of the world's ancient forests remain. |
[ ] |
| A. 10% B. 20% C. 50% D. 80% |
| 3. In general, the safest wood is _______. |
[ ] |
| A. Congo B. IKEA C. FSC D. Home Depot |
| 4. From the passage, we know that _______. |
[ ] |
| A. In Europe, 20% of the tropical wood used in our furniture is logged illegally. B. Ancient forests are rapidly vanishing because of the demand of human being. C. We have no ancient forests in our homes. D. We don't have to use the wood from a sustainable managed forest. |