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【单选题】
According to the passage, what will cause humans to live in the Eremozoic Era?A.
Forests razed can grow back.
B.
We are losing just a few species.
C.
Habitat loss and climate change.
D.
Humans would survive on the earth.
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举一反三
【多选题】2007年6月胡锦涛在中央党校发表的重要讲话中指出,科学发展观的( )。
A.
第一要义是发展
B.
核心是以人为本
C.
基本要求是全面协调可持续
D.
根本方法是统筹兼顾
【单选题】电磁炮是一种理想的兵器,它的主要原理如图所示,利用这种装置可以把质量为 m = 2.0 g 的弹体 ( 包括金属杆 EF 的质量 ) 加速到 6 km /s 。若这种装置的轨道宽为 d = 2 m ,长 L = 100 m ,电流 I = 10 A ,轨道摩擦不计且金属杆 EF 与轨道始终接触良好。对于轨道间所加匀强磁场的磁感应强度和磁场力的最大功率,下列结果中正确的是 ( ) 。
A.
B ＝ 18 T ， P m ＝ 1.08 × 10 8 W
B.
B ＝ 0.6 T ， P m ＝ 7.2 × 10 4 W
C.
B ＝ 0.6 T ， P m ＝ 3.6 × 10 6 W
D.
B ＝ 18 T ， P m ＝ 2.16 × 10 6 W
【单选题】关于肾单位的组成,哪项是正确的
A.
肾小体和泌尿小管
B.
肾小体，近曲小管，远曲小管和髓袢
C.
肾小体，近曲小管，远曲小管和细段
D.
肾小体和近端小管，远端小管和髓袢
【单选题】【C16】
A.
must have been provided
B.
might have provided
C.
must have provided
D.
might have been provided
【单选题】听力原文：W. Jack must have been joking when be said that he was going to quit his job. M: Don't be too sure. He told me that he was trying to sell his house. What conclusion does the man want us to make?
A.
He believes that Jack will not be able to sell his house.
B.
He believes that Jack was joking.
C.
He agrees with the woman.
D.
He believes that Jack will quit his job.
【简答题】杂交改良方法有 、 和 三种。
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