淡水鱼类最适在20℃～28℃的温度范围内生活，在“探究水温变化对_爱下问搜题

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问题选择题

淡水鱼类最适在20℃～28℃的温度范围内生活，在“探究水温变化对金鱼呼吸次数的影响”实验中，比较适合的水温变化范围是（　　）

A．5℃～10℃

B．10℃～15℃

C．15℃～20℃

D．20℃～25℃

答案

我们知道鱼类是变温动物，没有体温调节功能，其体温随外界水温高低而变化．因此，养鱼一定要注意水温．鱼的适温范围较大，0至30℃之间都可生活，最高极限水温是34℃，最适水温是20至28℃，所以实验时为了保证试验试验中数据的真实性，实验时温度要控制在鱼的生活适宜温度．

故选：D

完形填空

May was born with a cleft palate(腭裂). When she was a little girl, she had to 36 the jikes from naughty chidren who teased her about her misshaped lip. With all the teasing, Mary grew up 37 the fact that she was“diffrernt”. She was 38  that no one, outside her family,could ever love her until she 39 Mrs. Leonard's class.
In Mrs. Leonards' school at that time, it was   40  for teachers to give their children an annual 41  test. However, in Mary's case, 42 her cleft palate, she was hardly able to hear out of one ear.   43 not to let the other children have another“ 44 "to point out, she would 45  when her bad ear was tested each year. The “hearing test”was 46 by having a child walk to the classroom door,turn sideways, 47 one ear with a fingre, and then   48  what the teacher whispered. When Mary had to turn her bad ear towards her teacher she would 49  to cover her good ear. She knew that teachers   50  often say things like,“The sky is blue,”or“What color are your shoes?”But not on that day. Surely, God   51  seven words in
Mrs. Leonard's mouth that   52  Mary's life forever. When the test came, Mary heard:“ I wish you were my little girl.”You can imagine how deeply these words   53  Mary.
Yes, affirming (肯定）words are   54  to say to the people around you. While words from
a godly teacher can soften a heart, words form you can powerfully set the    55   of another
One's life.

B．in addition to

D．in spite of

多项选择题

在选择机械设备型号和厂牌时应考虑机械设置的经济性、可靠性、维修性、安全性和（）诸方面的性能。

A.环保性

B.可塑性

C.适应性

D.宜人性

E.密封性