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1.Some boys think that Nike basketball shoes,though still __

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1.Some boys think that Nike basketball shoes,though still _____
must-have item for some students,are becoming out of _____ date.
A.a;不填 B.a;the C.不填;the D.the;a
2.If the test taker finds an item to which an answer is not known,it may be _____ to leave it blank and go on with the test.
A.valuable B.advisable C.considerable D.probable
3.Scientists are racing _____ time in order to find a cure for bird flu as soon as possible.
A.along with B.around C.against D.ahead of
请附带解说,
1.Some boys think that Nike basketball shoes,though still __
1.A out of date短语,"过时 "
2.B "如果发现不会做,建议先空下继续后面的试题."
3.C RACE AGAINST TIME与时间赛跑