某牧场为了防止鸟类捕食草籽，用细网将其罩住，结果草籽的产量大幅度较少，其原因可能是
A．影响了鸟类帮助牧草传粉
B．使牧草场不能很好地通风透光
C．使昆虫大量繁殖，严重危害牧草
D．影响了鸟类帮助牧草传播种子
答案：C
题目分析：为了防止鸟类捕食草籽，用细网将其罩住，结果草籽的产量大幅度较少，其原因不是影响了鸟类帮助牧草传粉，故A错；不是使牧草场不能很好地通风透光，故B错；原因是使鸟类捕食不到昆虫而使昆虫大量繁殖，严重危害牧草，故C正确；原因不是影响了鸟类帮助牧草传播种子，故D错。
Some people do not like anything to be out of place, they are never late for work, they can remember people’s birthdays; and they are always 31 to their friends and family members. Mr. Brown is such a person. Mr. Brown works in a 32 , and he lives in the town alone . He only has a sister. She lives in 33 town with her husband and her son, Mike. Mr. Brown doesn’t have time to see his sister or her family, from one year to the 34 , but he never forgets 35 them different kinds of greeting cards. These days, he is busy 36 a birthday card and presents for the 20th birthday of his nephew, Mike. Last Sunday, Mr. Brown had quite a surprise. He drove home from the hotel at the usual time, and he drove his car very 37 , not too slowly or too fast. When he got home, he parked his car as usual in the right place, and then he went into the house to make supper. Suddenly, there was a 38 the door. Mr. Brown opened the door and found a policeman standing outside the door. “What’s wrong?” he asked 39 . ‘Did I drive on the wrong side of the street? Or did I make a mistake at work?’ “Hello, Uncle,” said the policeman with a big 40 on his face, “My name is Mike”.
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