题目内容
在一个相对平衡的生态系统中，物种达到最大量和最适量，但不排斥其他种生物的入侵，()
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在生物的生活环境中，影响生物的分布、形态和生理等的因素叫做生态因素。()
Ⅰ. At a pedestrian crossing:
a) When you have stepped off the pavement on to a zebra crossing, traffic must stop to let you cross. But don't be foolish: make sure that drivers have enough time to give way to you.
b) If a police officer is directing the traffic, watch for his signals. Do not cross until he holds up the traffic.
c) At a crossing with traffic lights, do not cross in front of traffic which has the signal to go.Ⅱ. At a bus or tram stop:
If you want to get on a bus or a tram' give a clear signal for it to stop and do not step into the road until it has done so. When you get off a bus or a tram and wish to cross to the opposite side of the road, do not walk behind the vehicle. Wait until the vehicle has moved off and make sure there is no other traffic before you cross the road
According to the passage, at a pedestrian crossing you should not ______.
In May 1927, at least four different people were planning to fly between New York and Paris. On the morning of 20 May, none of them had done so, yet Lindbergh took off from New York in his small plane. It was heavy with fuel and it seemed it would never get off the ground. Lindbergh hit several wet spots on the airfield and bounced dangerously. He got into the air just in time to avoid a tractor and some telegraph wires at the end of the field.
For the first eleven hours he flew along the Atlantic coastline. When he turned towards the open ocean, he had flown almost as far and as long as Alcook and Brown had in 1919.It was getting dark and the worst part of the flight was just beginning.
First, there was a freezing fog. For a time he avoided this by flying lower over the water. But then the fog came down to the tops of the waves. Lindbergh flew higher but it was so cold that ice formed on the wings. In the black darkness he shook the ice off by diving and turning sharply. Twenty-four hours had passed now, he was terribly tired. He was still over the Atlantic in darkness. He ate nothing because he thought it would be easier to stay awake on an empty stomach. Then dawn came. He saw a few fishing boats below. He dived down, switched off his engine and called out, "which way is Ireland？" The fishermen were too surprised to answer. But a few minutes later he was over the Irish coast. He had navigated by his own calculations and a few simple instruments. He flew on over England and crossed Paris. A huge, excited crowd of 100,000 people were waiting for him when he landed. He had flown for thirty-three and a haft hours. It is probably the most famous fight in history.
Lindbergh found it hard to take off because ______.
About the English language, Pedro
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