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【单选题】
一般机械中摩擦副的摩擦状态大多为--摩擦。A.
边界
B.
液体
C.
半液体
D.
半干
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【单选题】In the sentence 'Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable pollutants.', 'vulnerable' probably means ______.
A.
defenseless
B.
protected
C.
strong
D.
fragile
【简答题】The houses on the top of the mountain look small only because they are much (far) ______.
【简答题】Ben Carson started studying hard again and rose back to the top Because__________．
【简答题】We want to privilege them because without the top students, we can't remain a top university.
【单选题】顾客不能进行网上支付,下面的原因中不可能的是: ( )
A.
网上商店的硬件系统有故障
B.
银行的支付系统有故障
C.
顾客的支付金额太大了
D.
顾客自己不熟悉支付流程
【单选题】The top of the back room was broken because of ______ .
A.
the rain
B.
the crashing sound
C.
the falling tree
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