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单选题直线l1与l2夹角的平分线为y＝x，如果l1的方程是y－3x＋1＝0，那么l2的方程是（　　）．A x－3y＋1＝0B 3x－y＋1＝0C x－3y－1＝0D 3x＋y＋1＝0
Here is some _____ advice to any young businessman.
单选题At first why didn’t the writer want to climb down the rocks?A She was afraid she would fall.B She was too far away from pool.C She thought the bees would follow her.D She didn’t want her face to be unprotected.
单选题Only when your identity has been checked _____.A you are allowed inB you will be allowed inC will you allow inD will you be allowed in
单选题已知a，b是异面直线，直线c平行于直线a，那么c与b（　　）．A 一定是异面直线B 一定是相交直线C 不可能是平行直线D 不可能是相交直线
单选题Helen was much kinder to her youngest child than she was to the others, _____, of course, made the others jealous.A whomB thatC whatD which
单选题To our great _____, Tom’s illness proved not to be as serious as we had feared.A anxietyB reliefC viewD judgment
单选题The scientists are trying to find out the facts to _____ their theory.A supportB carryC designD raise
单选题Look at the clock! It’s time _____ work.A we startedB we’ll startC we’re startingD we have started
单选题It is with great pleasure _____ I accept your offer to join the club.A whichB whomC whoD that
It is common practice _____ a battery when it still has some
We did a marketing study for yellow telephone boxes and foun
单选题We all agree with him on _____ he said.A whatB thatC whyD which
Seat belts can make us safer because _____.
单选题下列说法正确的是（　　）．A 若直线l1与l2的斜率相等，则l1∥l2B 若l1∥l2则l1与l2的斜率相等C 若两直线中，一条斜率存在，另一条斜率不存在，则这两直线相交D 若两直线的斜率都不存在，则这两直线平行
The American couple have _____ a two-year-old child, who los
单选题Which of the following is TRUE according to this passage?A It won’t be dangerous if there are seat belts or air bags in a car.B Now most of new cars still have only one air bag.C When a car hits something, its air bags will come out a few minutes later