北京的国际标准时间为+8，多伦多的国际标准时间为﹣4，若北京时间为当天晚上8点，

在下面各数中，一个零也不读出来的数是（　　）

A．800700

B．807060

C．5060900

D．876000

I felt very tired when I got home, and I ______ straight to bed.

A．go

B．went

C．had gone

D．have gone

Not only ________ increase, but also _________ raised as well. [ ]

A. did the prices ; were their wages        

B. the prices did ; their wages were

C. did the prices ; their wages were        

D. the prices did ; were their wages    

《中华人民共和国建筑法》规定，承包单位有违法行为的，对因转包工程或者违法分包的工程不符合规定的质量标准造成的损失，与接受转包或者分包的单位承担( )。

A．法律责任

B．全部责任

C．主要责任

D．连带赔偿责任

用于哺乳动物细胞分化、组织形成过程的发育毒性研究的是（）

A.大鼠全胚胎培养

B.胚胎细胞微团培养

C.小鼠胚胎干细胞试验

D.致畸试验

E.发育毒性的体内预筛试验