在平面直角坐标系中，点M（t-3，5-t）在坐标轴上，则t=______．_爱下问搜题

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问题填空题

在平面直角坐标系中，点M（t-3，5-t）在坐标轴上，则t=______．

答案

∵点M（t-3，5-t）在坐标轴上，

∴点在x轴上或点在y轴上，即t-3=0，或5-t=0，

解得t=3或5．故答案填3或5．

完形填空

完形填空（共20小题;每小题1. 5分，满分30分）
A man and his wife arrived in Boston by train．After getting off the train, they walked without an 36____ into the outer office of Harvard’s president．So they were stopped by his secretary and kept 37____．For hours, the secretary took no notice of them, 38____ that the couple would finally become disappointed and 39____．But they didn’t．The secretary finally decided to disturb the president, though 40____．
A few minutes later, the president walked towards the couple with a 41____ face．The lady told him, “We had a son that 42____ Harvard for one year．He loved Harvard．He was 43____ here．But about a year ago, he was accidentally killed．My husband and I would like to 44____ a memorial（纪念物）to him, somewhere on campus．”
The president wasn’t moved．Instead, he was 45____．“Madam,” he said, “we can’t put up a statue for every person who studied at Harvard and died．If we did, this place would look like a 46____ ,” “Oh, no,” the lady 47____ quickly．“We don’t want to put up a statue．We would like to give a 48____ to Harvard．” The president rolled his eyes and 49____ at the couple and then exclaimed,” A building! Do you have any 50____ how much a building costs? We have spent over ＄7,500,000 on the campus building at Harvard．” For a moment the lady was silent．The president was 51____, because he could get rid of them now．Then the lady turned to her husband and said quietly, “Is that all it costs to start a 52____? Why don’t we just start our own?” Her husband nodded．53____ their offer was turned down．Mr.and Mrs.Stanford traveled to California where they founded Stanford University 54____ after them, a memorial to a son that Harvard no longer 55____ about．

C．acquaintance

D．appointment

C．unexpectedly

D．unwillingly

单项选择题

下列（）特征不属于缺失杂合体在减数分裂粗线期的构型。

A、十字形

B、弧形

C、断片

D、单尾