问题
单项选择题
下列不属于生物性危害的因素是（）
A.致病菌
B.寄生虫
C.抗生素
D.有毒蘑菇
答案
参考答案：C
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下列不属于生物性危害的因素是（）
A.致病菌
B.寄生虫
C.抗生素
D.有毒蘑菇
参考答案：C
| 根据短文内容，选择适当的单词或短语填空，使短文意思完整。每个选项至多使用一次，有两项剩余。 | |
made a path (小路) through the grass of the field 1______ their houses. One evening Brownie's family noticed that Brownie didn't return home. They went looking for him 2______. Brownie didn't show up the next day, and the next week. Spotty went to Brownie's house alone. He barked loudly. But Brownie's 3______ were too busy to care about him. Finally, one morning Spotty 4______ to take "no" for an answer. He followed Ted,Brownie's owner, every where he went. He barked, then rushed toward a nearby empty place and back, as if to say. "Follow me!" Finally, Ted followed the dog across the empty place. The little dog 5______ the man to a tree half a mile from the house. There Ted found Brownie alive one of his legs was crushed (压住) in a trap (老鼠夹). Ted wished he had come 6______. Then Ted noticed that, in a circle around the injured dog, a lot of 7______ was left over after lots of meals. Spotty had been visiting Brownie every day. He had stayed with Brownie to protect him, snuggling (依偎) with him at night to keep him 8______ and nuzzling (用鼻子爱抚) him to keep his spirits up. |