问题
单项选择题
有关TXA2下列哪种说法是正确的()
A．使cAMP生成减少
B．兴奋腺苷酸环化酶
C．扩张血管
D．抑制血小板聚集
E．由血管内皮细胞合成
答案
参考答案：A
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有关TXA2下列哪种说法是正确的()
A．使cAMP生成减少
B．兴奋腺苷酸环化酶
C．扩张血管
D．抑制血小板聚集
E．由血管内皮细胞合成
参考答案：A
 Weeks passed and the ___30_____over the coming Christmas grew into restlessness until the last day of ___31___before the holiday break. I smiled in ___32____as the last of them hurried out the door. Turning around I saw David ____33___standing by my desk. “I have something for you,” he said and ___34___ from behind his back a small box. ____35___it to me, he said anxiously. “Open it.” I took the box from him, thanked him and slowly unwrapped it. I lift the lid and to my ___36___saw nothing. I looked at David’s smiling face and back into the box and said, “The box is nice, David, but it’s ___37____”. “Oh no, it isn’t,” said David. “It’s full of love, my mum told me before she died that love was something you couldn’t see or touch unless you know it’s there.” Tears filled my eyes ___38___I looked at the proud dirty face that I had rarely given ____39___to. After that Christmas, David and I became good friends and I never forgot the meaning ____40___the little empty box set on my desk..
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