皮皮学，免费搜题
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【单选题】
以下关于心脏收缩期的说法正确的是A.
二尖瓣、三尖瓣开放
B.
二尖瓣、三尖瓣关闭
C.
主动脉瓣、肺动脉瓣关闭
D.
以上均错误
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】阅读短文，回答问题。 Here is a map of the United States. It's yellow. The U. S. is a beautiful country. In the U. S. they speak English. Look at the girl, she is from the U. S. She has short, curly and blond ha...
【简答题】选择出相对应的译文。 ( ) 1. a map of the United Sates ( ) 2. west of the U. S. ( ) 3. the capital city of the U. S. ( ) 4. the flag of the U. S. ( ) 5. the White House ( ) 6. Statue of L...
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【简答题】根据图片和汉语意思完成句子。 1. Here is a map of ______________. 2. The flag of the U. S. has ______________. 3. This is ________________ (白宫). 4. ______________ is in New York.
【简答题】2. The U.S. flag
____ (have) 13 stripes and 50 stars.
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