钻机必须使用（），不得使用其他油代用，以免影响液压元件的寿命_爱下问搜题

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问题单项选择题

钻机必须使用（），不得使用其他油代用，以免影响液压元件的寿命。

A、混合油

B、液压油

C、汽油

D、柴油

答案

参考答案：B

选择题

“无心插柳柳成荫”所描述的植物生殖方式是

A．扦插

B．嫁接

C．组织培养

D．播种

完形填空

Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight. “You need      ,” his father said. “But if you don’t work hard, no fortune will come.”
What made him sad was      his piano teacher in Beijing didn’t like him. “You have no talent(天赋). You will never be a pianist.”     nine-year-old boy Lang Lang was badly     . He decided that he didn’t want to be a      any more. For the next two weeks he didn’t touch the piano.      , his father didn’t push, but waited.
Luckily, the day came when his teacher asked him to      some holiday songs. He didn’t want to, but as he placed his fingers on the piano key, he      that he could show others that he had talent____.That day he told his father      he had been waiting to hear— that he wanted to study with a new teacher.      that point on, everything turned around.
He started      competitions(比赛). In the 1994 International Young Pianists Competition, when it was      that Lang Lang had won, he was too      to hold back his tears. Soon      was clear that he couldn’t stay in China forever—he had to play on the world’s big      . In 1997 Lang Lang      again, this time to Philadelphia, U.S. There he spent two years practicing, and by 1999 he had worked hard enough for fortune to take over. After his      performance at Chicago’s Ravinia Festival, gigs(特邀演出 ) in Lincoln Center and Carnegie Hall started      . Lang Lang finally worked to reach the place where fortune spots(发现) him, and lets him     .

C．competitions