患者男性，46岁。在连续硬膜外阻滞下行胆囊切除术，麻醉效果好，ECG示心率70次/分。术中手术医生突然说“血色发暗”。

“血色发暗”提示（）

A.灯光问题

B.呼吸抑制

C.低血压

D.全脊髓麻醉

E.局麻药中毒

小题1:Manatees eat about 100 ________(磅).

小题2:In China, we are supposed to_______(握) hands while we say “Hello” to others.

小题3:The flowers should _________(浇水 ) every day.

小题4:My grandfather had to get up at 5 am   to________ (点) the  fire for breakfast.

小题5:There will be a free concerts tonight.   Some bands will________(露面) then.

小题6:We are against ___________(建造) a new zoo.

小题7:We ‘ve learned a lot from _________(科学的) studies.

小题8:There are many_______(村民)planting the trees on the hill  now.

小题9:They often feed the animals in their _________(空闲的) time.

小题10:This manatee _________(重) 1,000 pounds.