The first step in setting up your home office is to decide ______ you will use your office—for study or for job-related work.
A. where
B. what
C. when
D. how
艾里克森人为，青少年（12-18岁）人格发展的主要问题是（）。
A. 自主感对自卑感
B. 亲密感对孤独感
C. 自主感对同一感混乱
D. 同一感对同一感混乱
In the summer of 1978, an English farmer discovered in his field that ______.
A. some of his wheat had been damaged
B. some of his wheat had fallen onto the ground
C. his grain was growing up in circles
D. his grain was moved into several circles
氧离曲线右移是因为( )。
A. 体温升高
B. 血液pH值升高
C. 血液PCO2降低
D. 2，3-磷酸甘油酸
E. H+浓度下降
微信支付 
支付宝支付