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【单选题】
PoWerPoint中，在占位符添加完文本后，怎样使操作生效()A.
按ENTER键;
B.
单击幻灯片的空白区域;
C.
单击保存;
D.
单击撤销。
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【简答题】夏天对着开水杯“吹气”，能使开水变凉，这是因为________吸热，使水温下降。冬天对着手“哈气”，使手变暖，这是因为水气遇冷________放热，使手表面温度升高。（均填物态变化名称）
【简答题】随着天气变热,___________________________。
【简答题】简述生物多样性的类型。
【简答题】All ________ is a continuous supply of the basic necessities of life. A) what is needed B) for our needs C) the thing needed D) that is needed
【单选题】Which of the following, according to the passage, contribute (s) to alcoholism? Ⅰ. the need to reduce tensions and anxieties Ⅱ. the anxieties resulting from guilt feelings about previous drinking bout...
A.
Ⅰ only
B.
Ⅰ and Ⅱ only
C.
Ⅰ, Ⅱ, and Ⅲ
D.
Ⅱ and Ⅲ only
【简答题】夏天对着热开水“吹气”可以使其变凉是因为加快了开水的______而使水温降低更快；冬天对着僵冷的手“呵气”可以使其觉得暖和是因为呼出的热水蒸气遇冷后______放热使手的表面温度升高．
【单选题】All of the following are true except that______.
A.
the shareholders were unaware of the needs of the workers
B.
the old firm owners hand a better understanding of their workers
C.
the limited liability companies were too large to run smoothly
D.
the trade unions seemed to play a positive role
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