We must do what we can do to keep the b of nature．
---Do you know Mrs. Yang ? ---Yes. When I worked in that international company, I with her twice. A．had talked B．talked C．have talked
―Are you still busy? ―Yes, I ________ my work, and it won’t take long. A. just finish B. am just finishing C. have just finished
下列各句中，没有语病的一项是（ ）A．《哈利·波特》中文版一经出版，便深受广大中学生读者所欢迎，短短九个月时间里，该书便重印了九次
如图3-6-8所示，一细线的一端固定于倾角为θ=45° 的光滑楔形滑块A的顶端P处，细线的另一端拴一质量为m的小球，试求当滑块以a=2g的加速度向左运动时细
（1）（4分）如图所示，游标卡尺的读数为 cm，螺旋测微器的读数为 mm ．
_______in 1636, Harvard is one of the most famous universities in the United States. A. Being founded B. It was founded C. Founded D. Founding
大麦种子萌发时，胚产生的赤霉素(GA)转运到糊粉层后，诱导相关酶的合成进而调节相关的代谢过程，促进种子萌发。如图所示，请回答： (1)种子萌发
是实数，则
的值为
B. 3 C. 0 D.
