In order to avoid disaster it would be wise ______. ()
A.to spend five minutes checking the car before you leave
B.to carry some emergency spares with you
C.to buy a cheap set of spares before leaving
D.to prevent all breakdowns from happening
第6题
哪项不是人体必需氨基酸
A.缬氨酸赖氨酸
B.亮氨酸异亮氨酸
C.酪氨酸胱氨酸
D.蛋氨酸苏氨酸
E.色氨酸苯丙氨酸
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