青蒿素（C15H22O5）是我国首创的新型抗疟疾药．下列关于青蒿素的叙述不正确的是（ ）．
青蒿素（C15H22O5）是我国首创的新型抗疟疾药．下列关于青蒿素的叙述不正确的是（ ）．
可知
People use the 311 call system to report _____.
People use the 311 call system to report \_\_\_\__.
The word “policing” in Paragraph 3 probably means _____.
The word “policing” in Paragraph 3 probably means \_\_\_\__.
Which of the following is the first state to raise smoking age to 21?
Which of the following is the first state to raise smoking age to 21?
封闭在汽缸内一定质量的理想气体，如果保持气体的体积不变，当压强增大时，以下说法正确的是（ ）．
封闭在汽缸内一定质量的理想气体，如果保持气体的体积不变，当压强增大时，以下说法正确的是（ ）．
I wish I finished writing the essay yesterday, but I was too busy.
I wish I finished writing the essay yesterday, but I was too busy.
一列简谐横波在某时刻的波形图如图1所示，从该时刻开始计时，图1中质点A的振动图像如图2所示．下列说法错误的是（ ）．
一列简谐横波在某时刻的波形图如图1所示，从该时刻开始计时，图1中质点A的振动图像如图2所示．下列说法错误的是（ ）．
They have decided to put the meeting _____ till next Monday.
They have decided to put the meeting \_\_\_\__ till next Monday.