As there is less and less coal and oil, scientists are exploring new ways of making use of ______________ energy, such as sunlight, wind and water for power and fuel.
A.abrupt | B.alternative | C.authentic | D.abstract |
_A Chinese runner,Liu Xiang,rushed to the ending line _______a surprising speed.
A.at | B.by | C.through | D.with |
_The work is easy for an expert _______it is difficult for an inexperienced person.
A.because | B.therefore |
C.while | D.unless |
_You must get up early in the morning, ______we’ll have to leave without you.
A.and | B.but | C.or | D.so |
_Stressful environments lead to unhealthy behaviors such as poor eating habits,which_______increase the risk of heart disease.
A.in turn | B.in return |
C.by chance | D.by turns |
_ I was_______ the point of telephoning him when his letter arrived.
A.in | B.to | C.at | D.on |