话题4【科普与事物发展类】-2021年中考英语完形填空分类训练（PDF版）

Text 1（江西中考） without protect goal harmful make warn quick nervous when danger When people hear the word stress, they usually think of something bad. However, stress can have several benefits (益处 ) for the body and mind. To begin with, people may feel stressed 1. there is something important to do. For example, some students are stressed before a big test. The stress might make them feel 2. , but it also makes them focused. This type of stress can help people work efficiently ( 高 效 地 ) to meet their 3. . Another way stress benefits us is by keeping us healthy. Scientists who study stress learnt a little stress can 4. the immune system (免疫系统) stronger. When your body learns to respond (反应) to some stress, it’s able to 5. you better from illness. The final way that stress benefits us is by helping us respond to 6. . If you see a car coming around the corner too fast, you might experience stress. This stress sends a message 7. your brain of danger, allowing your body to respond 8. . You may not be able to jump out of the car’s way soon enough 9. the stress. Of course, too much stress is 10. to our bodies and minds. But the right amount of stress makes us more efficient, healthier and safer. Text 2（江西中考） know life different back and interesting sign real find they The planet Mars is the closest and most similar planet to Earth. It is very 1. to scientists. For example, Mars has seasons with 2. weather, but other planets have the same temperatures all year round. Was there 3. on Mars? To find out, scientists need 4. if Mars ever had water. In 2004. two robot explorers (探测器), or ‘rovers’, called Spirit and Opportunity were sent to look for 5. of water. These rovers can drive over rocks 6. all kind of rough ground. They can also use cameras and send photos 7. to Earth. First, the two rovers found chemicals and patterns (图纹) in the r o c k s t h a t w e r e p r o b a b l y m a d e b y w a t e r . T h e n , t h e y m o v e d t o a n o t h e r a r e a a n d 8. other rocks wh