单项选择题

Nevertheless, motorists themselves can try to prevent problems from arising by ______.

A. driving short distances in hot weather
B. having their car insured for ￡ 20
C. driving slowly at all times
D. making sure their car is in good working order

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单项选择题

According to the theory of photoperiodism, ______.

A. birds should migrate in the middle of the winter
B. longer days cause changes in the bodies of birds
C. seasonal changes in the length of days do not affect migration
D. increasing daylight increases the distance of migration

单项选择题

22()

A.residing
B.living
C.stay
D.inhabit