题目

阅读下面的文字，完成下列小题。花开代表我爱你小哑回乡小住，正是人间四月天，天气却时风时雨，总也不够暖和，家乡的桃花梨花也因而开得冷冷清清，在轻阴灰白的天空下，像一场没有张罗好的婚礼。就在这样的气氛里，院子大门前的樱花树渐渐打起了深红的花苞。可惜的是，从去冬以来一直持续的干旱，让这些密匝匝的花骨朵看上去毫无水色。但我每天从门口进进出出，都密切地关注着它们的变化。因为，这是我送给母亲的树。三年前的春天As they migrate, butterflies and moths choose the winds they want to fly with, and they change their body positions if they start floating in the wrong direction. This new finding suggests that insects may use some of the same methods that birds use for traveling long distances. Scientists have long thought that insects were simply at the mercy of the wind.Fascinating as their skills of flight are, migrating behavior has been difficult to study in insects because many long distant trips happen thousands of feet above ground. Only recently have scientists developed technologies that can detect such little creatures at such great heights.To their surprise, though, the insects weren't passive travelers on the winds. In autumn, for example, most light winds blew from the east, but the insects somehow sought out ones that carried them south and they positioned themselves to navigate directly to their wintering homes.Even in the spring, when most winds flowed northward, the insects didn't always go with the flow. If breezes weren't blowing in the exact direction they wanted to go, the insects changed their body positions to compensate(补偿, 弥补). Many migrating birds do the same thing.The study also found that butterflies and moths actively flew within the air streams that pushed them along. By adding flight speeds to wind speeds, the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour. The findings may have real-world applications. With climate warming, migrating insects are growing in number. Knowing how and when these pests move could help farmers decide when to spray their crops.小题1:What's the main idea of the text?A．Insects migrate with the seasons.B．The wind helps insects greatly in migrating.C．Windsurfing insects have real direction.D．Scientists have trouble in observing insects.小题2:Scientists originally thought that _____.A．insects always waited for their favorable winds B．insects chose the winds they wanted to rideC．insects were just blown about by the windD．insects positioned themselves in the winds小题3:It is not easy to study the migrating behavior of the insects because ______.A．the little creatures can fly very fastB．their flight is long and high above ground C．the wind's direction is hard to forecastD．they have no regular migrating courses小题4:According to the passage, the findings can ____A．increase insects in numberB．instruct farmers when to spray their cropsC．prevent climate warmingD．help protect insects