大多数病原菌生长的最适宜温度为37℃。_爱下问搜题

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问题判断题

大多数病原菌生长的最适宜温度为37℃。

答案

参考答案：对

完形填空

阅读下面短文，掌握其大意，然后从所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
A daughter        to her father about her life and how things were so hard for her. She did not know whether she was going to make it and wanted to give up. She was        fighting and struggling. It seemed that if one problem was solved a new one       .
Her father, a cook, took her to the       . He filled three pots with water and placed each on a high fire. Soon the pots came to a        In one he placed       , in the second eggs, and in the last ground（磨成粉的）coffee beans. He let them sit and boil, without saying a word.
The daughter sucked her teeth and impatiently waited,        what he was doing. In about twenty minutes he        the burners. He        the carrots and eggs out and placed them in a bowl! Then he        the coffee into a cup. Turning to her, he asked, "Darling, what do you see?"
"Carrots, eggs and coffee," she replied.
He brought her closer and asked her to        the carrots. She did and noted that they were soft. He then asked her to take an egg and break it After pulling off the       , she observed the hard-boiled egg. Finally, he asked her to sip（啜饮）the coffee. She smiled as she        its rich aroma（芳香）.
"What does it mean, Father?" she asked.
He        that each of them had        the same adversity（厄运）, boiling water, but each reacted       . The carrot went in strong, hard, and unrelenting, but after being subjected to the boiling water, it        and became weak. The egg had been       , with its thin outer shell protecting its liquid inside, but after sitting through the boiling water, its inside hardened. The ground coffee beans were unique. After they were in the boiling water, they had        the water.
"Which are you?" he asked his daughter.
When adversity knocks on your door, how do you       ? Are you a carrot, an egg, or a coffee bean?

A．boring with

D．uncertain about

D．was happened

C．dinning room

B．understanding

A．immediately

C．differently

单项选择题

设有关系R(A,B,C)和S(A,D,E,F)，且R.A和S.A取自同一个域，与下面SQL语句： SELECT R.A,B,E,F FROM R,S WHERE R.A=S.A AND B=3等价的关系代数表达式是：

A．只有Ⅰ

B．只有Ⅱ

C． Ⅱ和Ⅲ

D．都等价