[单选] 尿沉渣计数(Addis计数)中白细胞的参考值为（　　）

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• [单选] I remember _______ her at the party last week．
• [单选] I have four letters to write today and I have finished_________．
• [单选] His hands _______ a little as he took up a pen and began to write．
• [单选] ________at his model plane over the weekend，he didn’t complete it．
• [单选] I looked and looked，and at last I made out two figures moving slowly in the _______.