—He, together with Tom, _____ going to visit Shanghai in July. How about you?
—I'm afraid I have to stay at home _______
A：are; on my own
B：is; by my own
C：are; on myself
D：is; by myself
根据《海燕》回答下列问题。
《春秋繁露》云：“与天同者大治，与天异者大乱，故为人主之道，英明于在身之与天同者而用之。”此话强调，君主应
Yesterday _____ National Day.
有关生物膜系统结构和功能的叙述，正确的是（ ）
