标准贯入试验时，最初打入土层不计锤击数的土层厚度为（）。A.15cm B.30cm

Justin Bieber was nominated for the Best New Artist Grammy 2011. Both he and his fans were excited to hear the great news!

Born on March 1, 1994, in Canada, Justin entered a singing contest when he was 12 and won the second place. He taught himself to play the piano, drums and guitar. In 2007 Justin posted videos of his singing on the Internet and became famous. In 2008, he became a singer with a record company. Since then, he has become a big name. Justin is so popular that screaming fans show up everywhere for his appearance. Several of his performances had to be cancelled because there were too many fans!

In February, 2011, Justin’s biopic Never Say Never will come out. Justin came from a poor family. But he said in his book that not having as many things as his friends made him stronger and built his character. He wants to tell people that you can do anything if you just put your mind to it.

小题1:Who taught Justin to play the piano, drums and guitar?

A．His fans.

B．His friends.

C．He himself.

D．His teacher.小题2:When did Justin become a singer with a record company?

A．In 1994.

B．In 2007.

C．In 2008.

D．In 2011.小题3:Why did Justin have to cancel some of his performances?

A．Because he was badly ill.

B．Because he thought his performances weren’t good enough.

C．Because he didn’t want to have any performances.

D．Because there were lots of fans.小题4:Which of the following is True according to the passage?

A．Justin was born in a rich family on March 1, 1994, in Canada.

B．Justin entered a singing contest when he was 12 and won the first place.

C．Justin is so terrible that he has few fans.

D．Justin said that poor environment made him stronger and built his character.小题5: What’s the meaning of the word “biopic” in the last paragraph?

A．自传

B．声明

C．论文

D．小说

新疆由于特殊的地理位置，白天光照强、气温高，夜间气温较低，所产的“葡萄”等水果特别甜。这是因为与别处相比：

A．新疆的土地特别肥沃

B．新疆的葡萄品种与别处不一样

C．新疆的葡萄只是进行光合作用，不进行呼吸作用

D．新疆的葡萄白天光合作用制造的有机物多，晚上呼吸作用消耗的有机物相对较少

由资料可知，金龙泉集团本部年生产能力达5万吨，比上一年增长( )倍。

A．3.57

B．2.57

C．1.57

D．1

“运费”栏应填：

A．0.3/1

B．502/0.3/2

C．502/0.3/3

D．此栏为空

MgO具有NaCl型结构。Mg²⁺的离子半径为0.078nm，O^2-的离子半径为0.132nm。试求MgO的密度(ρ)、致密度(K)。