If George took the job in Birmingham, he would have to leave his family at Wyeford.
A、True
B、False
C、Not Given
Compared with dreamless sleep, deep dream sleep is
A、not the result of natural selection
B、less likely to appear to monkeys
C、more protective to the animals
D、at a higher stage of evolution
Task 221. In most cases of cloud-to-ground lightning, the ground'ssurface__________22. One form of lightning that is ball lightning. __________23. Cloud lightning looks like a ribbon when its lighting channel__________24. Although not fully understanding processes of lightning, man__________25. Lightening can__________A. occurs most infrequentlyB. is shifted sideways by strong windsC. strike twice or more in the same spotD. is equipped with a good knowledge of various forms oflightningE. is estimated at 20 million a yearF. is positively charged