We won't be able to leave the office until the rain ______.
A. will stop
B. stops
C. stopped
D. is stopping
查看答案
关于鸟苷酸环化酶体系的叙述，正确的是
A. cGMP广泛分布于动物组织内，其含最与cAMP相当
B. 鸟苷酸环化酶可催化GDP生成cGMP
C. 鸟苷酸环化酶由G蛋白激活的
D. cAMP与cGMP在细胞内作用是相辅相成的
E. cGMP激活的蛋白激酶称为蛋白激酶C
Judging from his accent, I can ______ that he is from the south.
A. speak
B. look
C. tell
D. show
从溶解度上看，磷脂酰胆碱几乎不溶于
A. 丙酮
B. 苯
C. 乙醚
D. 氯仿
E. 热酒精
It is obvious that Jack can hardly understand the instructions of the mobile phone he is reading.
A. 杰克显然看不懂他正在阅读的手机说明书。
B. 杰克费了很大劲才看懂本来很明显的手机指令。
C. 显然，杰克努力去理解他正在阅读的手机指令。
D. 显然，杰克再费力也看不懂他正在阅读的手机说明书。
微信支付 
支付宝支付