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发布时间:2024-07-13 19:25:16

[单项选择]Two experimental garden plots were each planted with the same number of tomato plants. Magnesium salts were added to the first plot but not to the second. The first plot produced 20 pounds of tomatoes and the second plot produced 10 pounds. Since nothing else but water was added to either plot, the higher yields in the first plot must have been due to the magnesium salts.
Which of the following, if true, most seriously weakens the argument above
A. A small amount of the magnesium salts from the first plot leached into the second plot.
B. Tomato plants in a third experimental plot, to which a high-nitrogen fertilizer was added, but no magnesium salts, produced 15 pounds of tomatoes.
C. Four different types of tomatoes were grown in equal proportions in each of the plots.
D. Some weeds that compete with tomatoes cannot tolerate high amounts of magnesium salts in the soil.
E. (E) The two experimental plots differed from each other with respect to soil texture and exposure to sunlight.

更多"Two experimental garden plots were "的相关试题:

[单项选择]A man had several sons who were always fighting with each other. Try as he might, he could not get them to live together in peace. He decided to show them how foolish they were. He told them to bring a bundle of sticks. He tied the sticks together. He told each son to break off the bundle across his knee. They all tried and they all failed. Then the father undid the bundle. He handed them the sticks one by one. The boys broke the sticks easily.
"You see, my boys," said the father, "When you are together, you are strong. You are more than a match for your enemies. If you quarrel and separate, you are weak and can be broken./

The sons were always ______.
A. fighting
B. peaceful
C. strong
[单项选择]
Where were the two man killed
[单项选择]

W: Who were those two men you were talking to
M: They own a shopping center.
W: A shopping center Where is it
M: It’s that new one down on the Peninsula, about ten miles from here.
W: Oh yes, I’ve heard about it.
M: They’d like to have someone open another restaurant in the center.
W: You’re not thinking of moving the restaurant again, are you
M: No, I’m thinking about opening a branch.
W: I’ve heard that business is quite good there.
M: Those men did a study of the number of people who pass through the center each day, and the result was good.
W: Well, why don’t we look into it
M: But do you think we’ll have enough time to manage another branch
W: We could get George and Jane to manage it.
M: Do you think they have enough experience
W: They’re old enough. And we’ve trained them like your parents trained
A. They worked in a restaurant.
B. They had a restaurant in the shopping center.
C. They owned a successful restaurant.

[填空题]There were two small gatherings, each (attend){{U}} {{/U}}by some students.
[单项选择]
What were the two speakers going to do
A. Go bicycle-riding.
B. Go sailing.
C. Swimming.
D. Playing tennis.
[单项选择]What were the two environment campaigners claims against McDonald’s
A. The food carries health risks.
B. McDonald’s workers suffer poor pay and conditions.
C. Eating the company’s hamburgers can cause heart disease.
D. All of the above.
[填空题]What were the two prohibited antique items passengers tried to bring out of the country
[单项选择]There were around two and a half hours between the time the Titanic rammed into the iceberg and its fatal submersion. In this time 705 people were loaded into the twenty lifeboats. There were 473 empty seats available off lifeboats while over 1,500 people drowned. These figures raise two important issues. Firstly, why there were not enough lifeboats to seat every passenger and crew members on board. And secondly, why the lifeboats were not full.
How many people could all the lifeboats hold
A. 705
B. 473
C. 1,178
D. 1,500
[填空题]What were the two men’ s bags full of
[填空题]What were the two things that interested Dr. Huber

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