【单选题】红杉树是地球上仅存的红木科树种之一,美国红杉树公司有一片高大巨拨的红杉,躯干通体绛红,冠上枝桠通天遮日,根部直径达到8米。据说世界上最大的红杉树在澳大利亚,不幸其主干毁于雷电,最终定格在75.2米。树木的生长也是竞争的过程,在成长中尽快长高、长大就能争取到更多的阳光,根都粗壮之后,从地下获得的水分也会增加。所以,_______。 填入划横线部分最恰当的一句是。
【简答题】what is “board sling” used for?
【单选题】Twenty miles a long way to cover.
【单选题】Which of the following sentences is INCORRECT?(2012)
A.
Twenty miles seems like a long walk to him.
B.
No one except his supporters agree with him.
C.
Neither Julia nor I were going to the party.
D.
Few students in my class are really lazy.
【简答题】ax=8,当a=1时,x=( );当a=2时,x=( );当a=4时,x=( );当a=20时,x=( )。